Air and Fuel› Superchargers, Turbochargers and Components

Grimspeed

V2 Bypass Valve

$299.00

SKU: GRM126032BLK

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The GrimmSpeed Version 2 Bypass Valve is a high-performance component designed to prevent boost leaks. It features a CNC-machined billet 6061 aluminum body with an anodized finish for durability and corrosion resistance. The valve utilizes an oversized 38mm aluminum piston and Buna-N O-rings for a reliable seal.
Show original supplier description
The GrimmSpeed V2 Bypass Valve in black is engineered to replace the factory recirculating bypass valve on 2004-2021 Subaru STI and 2002-2007 WRX models. Its primary function is to provide more consistent venting of boost pressure during throttle lift events, which is crucial when modifying a turbocharged engine. When the throttle closes under boost, the turbocharger continues to produce pressure. The bypass valve recirculates this pressure back into the intake, preventing compressor surge and safeguarding the turbo. The OEM valve is adequate for stock boost levels but can become a limitation, flutter, leak, or fail inconsistently as boost increases. Constructed from CNC-machined billet 6061 aluminum alloy, this valve is both strong and lightweight, finished in a black anodized coating for corrosion resistance and aesthetics. It features a 38mm piston design for quick air dumping and a recirculating design that keeps boosted air within the intake system. This ensures accurate MAF readings and prevents the fuel trim issues sometimes associated with atmospheric bypass valves on MAF-based systems. This upgrade is recommended for any turbocharged Subaru that has seen increased boost through tuning or hardware modifications. It offers a straightforward, drop-in solution that is more reliable than the OEM unit at elevated boost levels.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandGrimspeed
Part NumberGRM126032BLK
CategoryAir and Fuel
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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