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If you drive a Cadillac CTS, the intake manifold plays a central role in engine breathing, throttle response, and overall drivability. Choosing the right intake manifold matters because a poor fit or low-quality material can cause vacuum leaks, rough idle, or reduced performance. This guide highlights the top shortlisted intake manifolds for the Cadillac CTS across common use cases, from reliable replacements to units aimed at improving airflow. We evaluated fitment, material quality, and common symptoms to help you pick the right option. Read on for the criteria that informed our selections and what to check before installation.
Looking for other parts? See all Cadillac CTS parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | X AUTOHAUX Intake Manifold Gasket Set with Throttle Body Gasket |  |
| Best Quality Built to a higher standard if you want something more solid | Vincos Lower Intake Manifold Gasket MS972401 (3.6L V6) |  |
| Best Budget The cheapest option that still gets the job done reliably | A-Premium Lower Intake Manifold Gasket Set for OHV V8 5.7L |  |
| Most Sold A high-volume bestseller chosen again and again | Sixity Auto Intake Manifold Gasket Set for Cadillac CTS 2.8L/3.6L V6 (2004–2009) |  |
| Best Value for Money The sweet spot between price and what you get | HiSport Intake Manifold Gasket Set for 3.6L GM V6 |  |
| Best Overall The best all-around choice for most situations | HiSport Lower Intake Manifold Gasket Kit for 3.6L V6 GM Engines |  |
1. X AUTOHAUX Intake Manifold Gasket Set with Throttle Body Gasket
| Brand Name | X AUTOHAUX |
|---|---|
| Material Type | Rubber |
| Item Thickness | 17.6 Millimeters |
This X AUTOHAUX gasket kit replaces the upper and lower intake manifold seals and includes the throttle body gasket and seals needed for a complete intake reseal on compatible GM 3.0L and 3.6L V6 engines. It is typically used when intake vacuum leaks, coolant or oil contamination, or rough idle indicate failing intake seals. The kit’s rubber construction is intended to withstand heat and pressure found in the intake system and the package includes multiple sealing rings to cover common leak points. For a Cadillac CTS owner, the set offers a straightforward way to return factory-level sealing without buying individual pieces separately. Installation requires cleaning the mating surfaces and careful torque of intake bolts to avoid distortion. Limitations are that fitment must be verified against the vehicle’s exact engine code and years, and a professional installation is recommended if you lack experience with intake removal because incorrect installation can cause leaks or engine issues.
Best for: Reliability-focused buyers who prioritize restoring proper engine sealing and preventing coolant or oil intrusion into the intake on a Cadillac CTS with a failing intake gasket.
Less Ideal for: Buyers seeking a universal multi-vehicle part or a plug-and-play aftermarket intake upgrade should look elsewhere; this is a direct replacement gasket set rather than a performance intake component.
- Includes both upper and lower intake manifold gaskets plus throttle body gasket for a complete reseal
- Rubber construction designed to resist heat and pressure in the intake system
- Supplies multiple seals to address common leak points for a more thorough repair
- Sells as a single kit so you get all necessary pieces without sourcing parts separately
- Fitment covers a range of GM models so you must confirm it matches the Cadillac CTS engine year and displacement before installing
- No detailed torque or installation instructions included, which can complicate DIY replacement
Verdict A complete intake manifold gasket kit that restores factory-style sealing for compatible Cadillac CTS V6 engines, provided you verify exact engine fitment before installation.
2. Vincos Lower Intake Manifold Gasket MS972401 (3.6L V6)
| Interchange part numbers | 12673300, MS972401, MS19966 |
|---|---|
| Engine compatibility | 3.6L V6 |
| Included | 1x lower intake manifold cover gasket |
This Vincos lower intake manifold gasket is a direct-fit replacement intended for the 3.6L V6 found in certain Cadillac CTS model years and other GM vehicles. It is supplied as a single lower intake manifold cover gasket and is used when replacing a leaking or degraded factory gasket during intake or spark plug service. The listing highlights interchange numbers (12673300, MS972401, MS19966) so it matches factory part references and many reviewers report an accurate fit. The gasket is described as sealed to prevent oil leaks and to keep contaminants out of the valve train, which matters on the CTS where intake sealing and oil control affect idle and emissions. Practical benefits include straightforward fitment and a low-cost way to restore a proper seal without replacing larger components. Limitations are that it is a single lower gasket only and installation requires correct torque and alignment to avoid premature failure; installers should follow factory torque sequence and inspect mating surfaces. This is a budget-friendly replacement for routine maintenance rather than an upgraded performance gasket for forced induction or high-boost builds.
Best for: Performance-oriented buyers who prioritize restoring factory sealing and reliable engine operation on a Cadillac CTS during maintenance or repairs.
Less Ideal for: Drivers building high-boost, racing, or heavy-duty CTS engines who need reinforced or specialty intake sealing; those users should choose performance-grade gasket solutions.
- Direct-fit design referencing common GM interchange numbers for correct fit on compatible 3.6L V6 applications
- Sealed profile intended to prevent oil leaks and contamination of the valve train
- Simple single-piece replacement that makes routine intake or spark plug service easier
- Widely available seller support and user feedback reporting good fitment on CTS variants
- Supplies only the lower intake manifold gasket rather than a full gasket set or additional seals
- Not marketed as a high-performance or reinforced gasket for high boost or race use
Verdict A cost-effective, direct-fit replacement lower intake manifold gasket to restore proper sealing on 3.6L V6 Cadillac CTS engines, best for maintenance repairs rather than performance upgrades.
3. A-Premium Lower Intake Manifold Gasket Set for OHV V8 5.7L
| Fitment | Lower intake, OHV V8 5.7L |
|---|---|
| Reference numbers | MS16350, MS92438 |
| Material | Silicone and foam |
| Package quantity | 1 |
This lower intake manifold gasket set provides the seals needed between the lower intake and the engine valley on 5.7L OHV V8 applications, including the Cadillac CTS 2004–2005 when equipped with that engine. It is supplied as a single silicone and foam composite gasket designed to match the original sealing surfaces and comes packaged for straightforward installation. The material claims high temperature and chemical resistance, and customer feedback indicates the pieces are sized to OEM dimensions and install without modification. For routine engine rebuilds or replacing a leaking lower intake gasket, the set offers a cost-effective way to restore a proper seal and prevent vacuum leaks that can cause rough idle and poor drivability. Limitations are that this is a single lower gasket only and not a full manifold gasket kit, and buyers should verify the exact engine code and reference numbers MS16350 or MS92438 before ordering to ensure correct fitment for the CTS application.
Best for: Budget-conscious owners focused on a practical, cost-saving repair who want a straightforward replacement for a leaking lower intake gasket on a 2004–2005 Cadillac CTS with the 5.7L OHV V8.
Less Ideal for: Owners seeking a complete multi-piece intake gasket kit or those who do not have the specified 5.7L OHV V8 engine in their CTS should look for a different part.
- Direct-replacement fit for LS1-era 5.7L OHV V8 engines used in compatible CTS models
- Silicone and foam composite offers good sealing and temperature resistance
- Reported OEM-size accuracy means straightforward installation with factory components
- Affordable option compared with dealer or specialty shop gaskets
- Includes only the lower intake gasket and foam pieces, not a complete manifold gasket kit
- Fitment is limited to the specified OHV V8 5.7L engines so it is not universal
Verdict A cost-effective, OEM-dimension lower intake gasket for the 5.7L OHV V8 CTS that restores sealing without the price of dealer parts.
4. Sixity Auto Intake Manifold Gasket Set for Cadillac CTS 2.8L/3.6L V6 (2004–2009)
| Compatible Vehicles | Cadillac CTS 2004–2009 2.8L and 3.6L V6 |
|---|---|
| Includes | Upper and lower intake gasket sets with hardware |
| Brand | Sixity Auto |
| Item Count | 1.0 Count |
This intake manifold gasket set supplies the seals needed when removing or reinstalling the intake on Cadillac CTS V6 engines from 2004 through 2009. It includes both upper and lower sets intended as a direct replacement to reseal the intake manifold and prevent vacuum leaks, coolant crossover leaks, and associated rough idle or coolant loss. Typical use is during intake removal, routine gasket replacement, or when repairing leaks around the intake ports. The listing highlights compatibility with both 2.8L and 3.6L CTS engines and comes packaged with the necessary hardware. Practical benefits are straightforward: it lets you restore factory-style sealing without sourcing individual gaskets, and the kit simplifies a multi-piece job by grouping parts together. Limitations are that the listing does not specify material composition or OEM cross-reference and the fit depends on correct VIN/engine confirmation before installation, so professionals or careful DIYers should verify fitment first.
Best for: Risk-averse mainstream buyers who prioritize restoring factory-level sealing and want a ready-made kit for routine intake gasket replacement on their Cadillac CTS V6.
Less Ideal for: Users seeking OEM-branded gaskets with explicit material specs or those who need documented manufacturer cross-references should consider dealer parts or verified OEM alternatives.
- Complete upper and lower intake gasket sets provided for the specified CTS V6 engines
- Sold as a direct replacement to reseal intake passages after removal or repair
- Includes hardware in the package so fewer additional parts are required
- Manufacturer materials and exact gasket composition are not specified in the listing
- Fitment requires confirming VIN/engine code to ensure correct application
Verdict A convenient, multi-piece gasket kit for resealing CTS V6 intake manifolds that suits cautious owners needing a full replacement set, provided fitment is confirmed.
5. HiSport Intake Manifold Gasket Set for 3.6L GM V6
| Compatible engines | 3.0L and 3.6L GM V6 |
|---|---|
| OE numbers referenced | 12691199, 12673300, 12673301, 12646459 |
This HiSport gasket set is built to replace factory intake manifold gaskets on GM 3.0L and 3.6L V6 engines and is intended for repair use when the intake needs resealing. Each gasket is described as coated with an elastomer layer to improve sealing and resist oil or vacuum leaks that can cause rough idle or check-engine lights. In practice the set is used during intake manifold removal and reinstallation and should help restore proper intake sealing when matched to the correct engine VIN and model year. The product lists multiple OEM reference numbers for cross-checking fit and includes images showing gasket shapes and O-ring details. Expect a budget-friendly aftermarket option that delivers adequate sealing for routine engine repair, but confirm exact engine designation and VIN fitment before installation because coverage spans many GM models and a wrong selection will not fit. Installation requires moderate mechanical skill and standard shop procedures for torque and surface prep to avoid leaks.
Best for: Practical optimizers who prioritize value and want a cost-effective replacement gasket set to repair intake leaks on a Cadillac CTS with a 3.6L GM V6 while avoiding dealer markups.
Less Ideal for: Buyers seeking a direct factory-sourced part with guaranteed fitment or those uncomfortable with performing or supervising intake manifold replacement should consider dealer parts or professional installation.
- Elastomer-coated surfaces for improved sealing against oil and air leaks.
- Matches multiple GM OEM reference numbers for cross-checking compatibility.
- Includes shapes and O-ring details needed for a complete intake reseal.
- Budget-friendly option compared with dealer parts.
- Wide fitment list means you must verify exact engine VIN and model year to ensure correct fit.
- Aftermarket tolerances can vary so careful surface cleaning and correct torque procedure are required for reliable sealing.
Verdict A budget-friendly gasket set that offers elastomer-coated sealing for GM 3.0L/3.6L V6 intake repairs, but confirm exact engine fitment before buying.
6. HiSport Lower Intake Manifold Gasket Kit for 3.6L V6 GM Engines
| Brand Name | HiSport |
|---|---|
| Manufacturer | HiSport |
| Compatible Engine | 3.6L V6 |
| Part Number(s) | 12673300, MS19966, MS972401, 12590958 |
This HiSport lower intake manifold gasket kit is a direct replacement designed for GM 3.6L V6 engines used in models like the Cadillac CTS. It supplies the necessary gaskets to reseal the lower intake, preventing vacuum and oil leaks that can cause rough idle, reduced fuel economy, or engine misfires. Typical use is during intake manifold service or when diagnosing a known intake leak; the kit fits into factory repair procedures and installs like a standard factory-quality gasket set. Notable features include cross-referenced part numbers for compatibility and construction aimed at an airtight seal to keep contaminants out of the valve train. The practical benefits are straightforward: a relatively inexpensive way to stop leaks, restore drivability, and avoid further engine damage. Limitations are that fit depends on correct part selection and installation torque; the product description emphasizes proper tensioning and checking part numbers before install, and the kit does not include installation hardware or instructions beyond basic guidance, so some mechanical experience is recommended.
Best for: Balanced buyers who prioritize reliable, factory-style repairs and want a straightforward gasket kit to restore engine sealing during maintenance or intake manifold service.
Less Ideal for: Drivers looking for a plug-and-play kit with installation hardware, novice DIYers without mechanical experience, or those seeking performance upgrades rather than a direct replacement.
- Designed for GM 3.6L V6 engines commonly found in Cadillac CTS applications
- Cross-referenced to multiple OEM part numbers for easier fit verification
- Engineered to form an airtight seal to prevent oil and vacuum leaks
- Compact, single-purpose kit suitable for intake manifold service
- Does not include detailed installation hardware or step-by-step instructions
- Fitment requires verifying part number and careful torque during installation
Verdict A practical, factory-replacement lower intake gasket kit for 3.6L Cadillac CTS engines that restores sealing when correctly matched and installed.
Choosing the Right Cadillac CTS Intake Manifold: Key Factors to Consider
Fitment and Port Alignment
Correct fitment is the single most important factor because the manifold must mate precisely to the cylinder head and intake ports. Misaligned ports can cause poor sealing, disrupted airflow, and accelerated gasket wear.
Check that bolt patterns, sensor bosses, and vacuum ports match the Cadillac CTS engine variant. Proper port alignment reduces the risk of vacuum leaks and ensures consistent air distribution to each cylinder, which matters for smooth idle and even power delivery.
Material and Construction Quality
Materials determine how well the manifold resists heat cycling, warpage, and corrosion over time. Cast aluminum and high-grade composites each have tradeoffs: aluminum offers rigidity and good thermal conductivity, while engineered composites can reduce heat soak and weight.
Look for manifolds with consistent wall thickness, clean internal casting or molding, and corrosion-resistant finishes. Robust construction reduces the chance of cracks or deformation that lead to leaks and premature replacement.
Gasket Interface and Sealing Design
The mating surface and gasket design affect long-term sealing reliability. A well-designed gasket interface compensates for minor surface imperfections and maintains a tight seal under thermal expansion.
Verify whether the manifold is designed for reusable or one-time-use gaskets and whether it requires specific torque sequences. Good sealing design lowers the probability of intake manifold gasket failure and associated symptoms like coolant intrusion or vacuum loss.
Compatibility with Sensors and Vacuum Lines
The intake manifold must accommodate the vehicle’s sensors, vacuum ports, and actuator connections without modification. Incorrect or missing provisions can force workarounds that introduce failure points or change system behavior.
Confirm the presence and location of MAP, IAT, or manifold absolute pressure sensor bosses, and that vacuum taps align with the factory routing. Direct compatibility simplifies installation and preserves proper engine management and emissions control functionality.
Ease of Installation and Serviceability
A manifold that is straightforward to install reduces labor time and the chance of installation errors. Features that aid serviceability include accessible bolt locations, clear port labeling, and compatibility with standard torque specs.
Consider whether the design allows for partial disassembly for cleaning or maintenance and whether it includes guidance on torque values and sequences. Easier installation also makes routine tasks like intake manifold cleaning less intrusive.
Flow Characteristics and Performance Potential
For drivers interested in responsiveness or modest performance gains, internal port shape, plenum volume, and runner length matter. Smooth transitions and consistent cross-sections help maintain laminar flow and even air distribution.
While large-scale performance upgrades may require supporting modifications, choosing a manifold with improved flow characteristics can yield better throttle response and a more efficient air charge under normal driving conditions.
FAQ
What are common intake manifold symptoms on a Cadillac CTS?
Common symptoms often include rough idle, reduced throttle response, and poor fuel economy. Drivers may also notice vacuum-related issues such as a hissing sound from the engine bay or intermittent stalling. Symptoms usually vary with leak size and location, so small leaks may only appear under certain load or temperature conditions.
How do I diagnose an intake manifold vacuum leak?
Start with a visual inspection of gasket surfaces, vacuum hoses, and visible cracks. Listening for hissing while the engine runs and using a smoke machine or handheld vacuum gauge are common diagnostic steps. A consistent diagnostic approach narrows down whether the fault is the manifold surface, a gasket, or a connected vacuum line.
Can intake manifold cleaning help resolve drivability issues?
Cleaning the intake manifold can remove carbon buildup and restore smoother airflow, which may improve idle quality and throttle response. It is often a useful maintenance step before replacing parts. However, cleaning will not fix structural issues like cracks, warped flanges, or degraded gasket surfaces that require replacement.
Do intake manifolds require specific torque specs during installation?
Yes, correct torque values and a proper tightening sequence are important to achieve an even seal and avoid warping. Torque specs help prevent overtightening that can crush gaskets or cause flange distortion. Consult manufacturer or service documentation for the exact values and sequence for the Cadillac CTS engine to ensure reliable sealing.
How We Chose the Best Cadillac CTS Intake Manifold
Our selection process focused on factors that directly affect fitment, longevity, and day-to-day drivability for Cadillac CTS owners. We prioritized manifolds manufactured to precise OE dimensions to ensure gasket seating and correct port alignment. Material durability was evaluated by looking for designs that resist warping and corrosion under typical engine temperatures. We considered port finish and internal flow characteristics because these influence airflow uniformity between cylinders and throttle response. Compatibility with factory sensors and vacuum lines was required to avoid extra modifications. Ease of installation and available torque specs or clear installation guidance were included as practical filters. We excluded manifolds that required extensive machining, modification, or major intake-tract redesigns. We also filtered out units with known fitment ambiguity or lacking clear provisions for gaskets and mounting hardware. The final list balances reliable replacement options and units that offer measurable breathing improvements while keeping installation straightforward.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing an intake manifold for a Cadillac CTS, prioritize precise fitment, a durable construction, and a sealing design that matches the engine’s gasket and vacuum layout. These factors most directly affect drivability and long-term reliability. If you want modest performance or responsiveness gains, also consider internal flow and plenum design but remember those gains often depend on supporting components. Balance ease of installation and serviceability with material quality to get the best long-term result for your vehicle.
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