TRQ Intake Manifold Compatible with Buick Rainier Chevy Trailblazer

In this review of the TRQ Intake Manifold the bottom line is simple: it is a cost-effective, vehicle-specific OE replacement for owners of 4.2L I6 models who need a direct-fit upper intake manifold. The reviewer found it useful for routine replacement and for addressing EGR-related flow problems, though fitment and seam finish were mixed across installs. If you need an aftermarket replacement that follows factory routing and includes the gasket, this TRQ assembly is worth considering, but buyers should check the listing fitment carefully before purchase.

Key Features

• Direct Fit: Designed as an OE replacement to match factory mounting points for the listed 4.2L I6 vehicles, reducing modification during installation.
• Vehicle Specific: Fitment covers model years and variants including Trailblazer, Envoy, Rainier, Bravada, Ascender and Saab 9-7X so buyers can confirm compatibility in the listing.
• Complete Upper Assembly: The unit is the upper intake manifold and arrives as a single piece to simplify replacement of the worn or cracked original.
• Gasket Included: Ships with the required gasket or seal to help prevent immediate vacuum leaks when installed correctly.
• Aftermarket Reference Numbers: Lists reference numbers 615-567, 8890178000 and 89017551 to aid verification and parts matching.
• Material: Constructed from durable plastic designed to resist corrosion and reduce weight compared with metal alternatives.

Who It's For

This intake manifold is aimed at owners and independent mechanics working on 4.2L inline-six GM-family SUVs and crossovers from the early to mid 2000s who want a direct-fit aftermarket replacement rather than sourcing an OEM reman or used unit. It is particularly useful if the original part shows cracks, warped sealing surfaces, or if EGR-related clogging has impacted intake routing.

Shoppers who require perfect OEM cosmetic finish or who are extremely sensitive to seam appearance may want to inspect the part closely on arrival or consider a dealer-supplied OEM unit. Also confirm the exact model year and vehicle variant in the listing before purchase to avoid fitment issues.

Pros & Cons

Pros

• Functionally restores intake flow and can resolve EGR-related flow problems when the manifold is the root cause.
• Includes the gasket, which helps speed installation and reduces the need to source additional parts.
• Good value compared with buying a new OEM assembly, and many users report solid long-term functionality.
• Coverage across many 4.2L I6 models makes it useful for multi-vehicle shops or owners with compatible SUVs.

Cons

• Some customers report mixed fitment and occasional vacuum leaks around the spider seal or seams, so careful installation and inspection are advised.

Specifications

Compatible Engines	L6 4.2L
Vehicle Fitment	Trailblazer, Envoy, Rainier, Bravada, Ascender, Saab 9-7X (see listing)
Years Covered	2002-2007 (varies by model)
Position	Upper intake manifold
Material	Plastic
Gasket Included	Yes
Reference Numbers	615-567, 8890178000, 89017551

Our Verdict

The TRQ intake manifold is a practical, affordable OE-style replacement for owners of 4.2L I6 GM vehicles who need a functioning upper manifold and gasket included. While fitment and seam finish can vary, its overall functionality and value make it a reasonable choice for DIY repairs and independent shops when the listing confirms compatibility.

Frequently Asked Questions

Will this manifold fit my 2004 Buick Rainier?
Yes, the TRQ upper intake manifold lists compatibility with the 2004-07 Buick Rainier L6 4.2L, but always verify exact year and engine variant in the product listing.

Does it include the necessary gasket?
Yes, the product ships with the gasket or seal included to help prevent immediate vacuum leaks when installed correctly.

Are there common installation issues?
Some installers report mixed seam quality and occasional vacuum leaks around the spider seal, so inspect sealing surfaces and torque hardware to spec during installation.