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GrimmSpeed Top Mount Intercooler Y-Pipe Kit 2002-2007 WRX / 2004-2021 STI

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  • Just bought an STI TMIC that requires an STI Y-pipe to fit? Want to replace your chewed up and leaking couplers? Maybe you're just looking to freshen up your engine bay with a touch of GrimmSpeed style. Note: This kit is ONLY for use with cars equipped with an STI intercooler or a GrimmSpeed intercooler.

    Quick Specs

    • One-Piece Aluminum Casting - Precise fit and smooth flow without distortion
    • Thick Flanges - Prevent heat and vibration from cracking casting
    • Machined Flanges - Ensures a perfect fit, leak-free seal, every time
    • 5-Ply High-Grade Silicone Couplers - Smooth interior to maximize airflow and minimize restriction
    • Heat Resistant Reinforcement - Couplers keep their shape, even at high boost levels
    • Stainless Steel High-Torque Clamps - Rust-proof construction with smooth operation
    • Black Zinc Coated Hardware - Ditch those nasty OEM fasteners


    The GrimmSpeed TMIC Y-pipe has been completely redesigned to make use of a single-piece aluminum casting that's machined after the casting process to ensure perfectly flat flanges and precise fitment every single time. With inspiration from the OEM Y-pipe, GrimmSpeed engineers set out to balance the airflow through the Y-pipe to evenly distribute charge air across the inlet end tank on your Top Mount Intercooler. The 5-ply silicone couplers are fiber reinforced to prevent distortion in high boost scenarios but offer mobility and flexibility, isolating your TMIC assembly from the vibrations of your engine. Each 90-degree coupler is slightly oversized on the turbo side so that it can be trimmed-to-fit with a number of different stock location turbos. This Y-pipe is exactly what you need in order to upgrade your WRX TMIC to an STI or GrimmSpeed TMIC. If you've got an STI, the GrimmSpeed y-pipe offers a fresh look and better flow distribution. All kits come with replacement 90-degree turbo outlet couplers and throttle body couplers.


    • All 2002-2007 WRX (with STI or GrimmSpeed intercooler ONLY)
    • All 2004-2021 WRX STI.
    • 2004-2008 Forester XT (with STI or GrimmSpeed intercooler ONLY)
  • SKU#: 10379JE, 10379RE

    Shipping Weight: 6.0 lb

    Supplier: GrimmSpeed

    Category: GrimmSpeed, Intercoolers