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Top Mount Intercooler Aluminum Y-Pipe Kit - Subaru

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Have questions about fitment or applications? Contact Us

Product Description

Special Fitment Note: Supported fitments include only those vehicles running OEM STI and GrimmSpeed top mount intercoolers.

A high-quality y-pipe solution for all. 

Just bought an aftermarket or 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. Well, there's something for everybody with the GrimmSpeed Y-Pipe Kit.

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 90deg turbo outlet couplers and throttle body couplers.


- 02-07 Subaru Impreza WRX (w/ STI or GrimmSpeed TMIC only)

- 04-17 Subaru Impreza STI (w/ STI or GrimmSpeed TMIC only)

- Subaru Forester XT (w/ STI or GrimmSpeed TMIC only)


Product Reviews

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Product Reviews

  1. fits well

    Posted by Nicolas

    Installation went well, just had to remove once to get intercooler to line up correctly. Only wish it came with a new set of gaskets between y pipe and intercooler. My 2011 STI is running great again. Quality parts and fit well.

  2. fits great on 04 forester xt

    Posted by booboosit@gmail.com

    Worked great on my 04 forester xt

  3. does not fit early SG9

    Posted by Unknown

    As per heading - this does not fit the early Forester XT SG9 (2003 / 2004 in australia) - the blow off valve mount is different. This is something that is hard to address - other Subie blow off valves which will fit the mount then connect differently causing issues with connecting pipework. Aftermarket blow off valve options are limited, and seem to be limited to atmo venting.
    The y-pipe fits the GS intercooler fine, but again, will not fit the original I/C for this year XT.
    Resoultion for me is to go to another make of intercooler having had a direct face to face with the dealer for that brand, and this will be a 3 week wait...
    Very disappointing because the GS product is otherwise choice. GS might want to revise the suitability of the I/C & Y-pipe for the early Forester XTs &/ or highlight the need to check the shape/ fitment of the blow off valve.

    GS STAFF: Thank you for the insight! The y-pipe was designed to be a direct replacement for the OEM STI Y-Pipe in the US and we weren't able to check fitment for vehicles like yours that aren't available here. We'll add a note to our website and of course, you can be in touch with our customer service staff for an exchange or return!

  4. Fit My HyperFlow Intercooler

    Posted by Jason

    Bought this cause the one I originally had really sucked. The quality of everything was top notch!!! It bolted up, perfectly to my Huge a** Hyperflow intercooler.

    Keep the amazing products coming Grimmspeed : )

    Shoutout to Art for the speedy email responses as well ^_^