Saihisday lower intake manifold gasket — direct-fit replacement for GM V6 2008–2016 (12590958/12673300)

This Saihisday lower intake manifold gasket is a direct-fit replacement designed for a range of General Motors vehicles including Buick Enclave, Chevrolet Traverse, GMC Acadia (2009–2016), Cadillac CTS (2008–2011), Buick LaCrosse, Chevrolet Camaro, and several others. Manufactured for longevity and resistance to breakage, the gasket kit ships as a single-piece set intended to restore a proper seal between the intake manifold and cylinder heads. Professional installation is recommended because proper torque and surface prep are critical to prevent vacuum leaks and coolant cross-contamination.

Which vehicles and part numbers does this gasket replace?

This Saihisday gasket fits many GM V6 applications and is produced to match factory mounting points and sealing surfaces. It is listed as a replacement for OE part numbers 12590958 and 12673300 and covers multiple model years and trims.

• Buick Enclave, LaCrosse (specified years within 2009–2016 range)
• Chevrolet Traverse, Camaro (selected model years 2010–2011 for Camaro)
• GMC Acadia and Cadillac CTS, STS (2008–2016 coverage depending on model)
• Also compatible with Saturn Outlook and other related GM platforms listed by year

How durable and reliable is this replacement gasket?

Saihisday manufactures this gasket from materials chosen to resist warping and cracking under heat cycling typical of V6 engines. The construction reduces the likelihood of premature failure, helping maintain intake vacuum and coolant passages that rely on a leak-free seal.

• Engineered for higher tear and heat resistance than inexpensive generic gaskets
• Precision molded to match OEM sealing surfaces and bolt-hole alignment
• Less prone to brittle failure when compared with older or worn gaskets

What’s included and will I need any extras to install it?

The package contains one lower intake manifold gasket as pictured; installation hardware and instructions are not included. Because intake manifold replacement often involves coolant and torque-sensitive fasteners, you’ll likely need basic shop supplies and possibly new bolts or seals depending on vehicle condition.

• Package includes: 1 lower intake manifold gasket (as shown in product images)
• Recommended: new intake bolts, thread locker or torque-angle tools as needed
• Professional installation advised when torque specs and coolant system bleeding are required

How will this gasket affect engine performance and maintenance?

A correctly sealed intake manifold gasket restores proper air and coolant routing and helps prevent vacuum leaks that cause rough idle, poor throttle response, or diagnostic trouble codes. While it does not increase horsepower, replacing a failed gasket improves drivability and reduces the risk of coolant contamination or overheating that could lead to more costly repairs.

• Stops intake vacuum leaks that can trigger check-engine lights or rough running
• Helps prevent coolant from leaking into intake passages or engine bays
• Supports long-term engine reliability when installed and torqued to spec

Who is this for: This Saihisday lower intake manifold gasket is intended for DIY mechanics and professional shops working on GM V6 platforms listed above who need a durable, direct-fit replacement for OE part numbers 12590958 and 12673300. Choose this part if your vehicle shows signs of intake leaks, coolant loss related to the intake manifold area, or if you’re rebuilding the intake assembly as part of scheduled maintenance or repair.