Does a 2004 or 2005 Forester XT need anything extra for this valve?

Yes. GrimmSpeed states that the 2004-2005 Forester XT needs an STI-style top mount intercooler before the Version 2 Bypass Valve for GD WRX and EJ applications will fit, and the same applies to every 2004-2006 Baja Turbo. The 2006-2008 Forester XT is listed without that requirement.

Does the Version 2 Bypass Valve for GD WRX and STI models need a tune?

No. GrimmSpeed sets the steel spring at the factory, so the Version 2 Bypass Valve for GD WRX and EJ257 STI models runs on the stock calibration with nothing to adjust. Owners who later raise boost with a pro tune benefit most from its stronger seal.

Does the STI version reuse any factory parts?

Yes. On the STI, the GrimmSpeed valve reuses the recirculating elbow from the factory bypass valve, which keeps the original alignment. Keep the elbow when removing the old valve, and the swap stays a bolt-in job with the original hose routing intact.

Will it fit a 2008-2014 WRX or a Legacy GT?

No. The 2008-2014 WRX and 2005-2009 Legacy GT use a different mounting footprint, and GrimmSpeed builds a separate version for them around the same internals. This listing covers the GD WRX, EJ257 STI, SG Forester XT and Baja Turbo fitment only.

Why upgrade the factory STI bypass valve?

The factory STI valve is a cast unit, and in GrimmSpeed testing stock EJ valves leaked internally from 19 psi, a level many tuned STI owners exceed. The GrimmSpeed replacement uses a billet 6061 aluminum body, Buna-N seals and a 38mm piston designed to hold roughly twice the stock pressure.

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Description

GrimmSpeed Version 2 Bypass Valve for GD Subaru WRX and STI, GR / GV / VA STI, and SG Forester XT

GrimmSpeed’s Version 2 Bypass Valve for GD WRX, SG Forester XT and every EJ257 STI built from 2004 to 2021 swaps the cast factory valve for a billet 6061 aluminum body with a 38mm piston, and it was built after GrimmSpeed watched stock EJ valves leak internally from 19 psi. That threshold sits inside the range a tuned STI runs every day, so tuned owners are the clear audience. At factory boost the stock valve is less of a weak point.

Fitment and Installation

On the STI, the GrimmSpeed body bolts in place of the factory valve and reuses the original recirculating elbow. The same valve internals serve a footprint shared with the GD WRX, SG Forester XT and Baja Turbo.

Features

Body and base CNC-machined from billet 6061 aluminum, replacing the cast factory STI housing
Oversized 38mm hard aluminum piston for fast pressure release
Factory-set steel spring with no shims or adjustment
Rotating swivel fitting for clean routing on custom charge piping
Red or black anodized finish that resists corrosion in a hot EJ engine bay

Applications

Subaru Baja Turbo: 2004-2006 | 2.5L EJ255
Subaru Forester XT: SG | 2004-2008 | 2.5L EJ255
Subaru WRX: GD | 2002-2007 | 2.0L EJ205, 2.5L EJ255
Subaru WRX STI: GD / GR / GV / VA | 2004-2021 | 2.5L EJ257

Notes

GrimmSpeed states that the 2004-2005 Forester XT and the 2004-2006 Baja Turbo require an STI-style top mount intercooler, such as the GrimmSpeed Top Mount Intercooler Kit for GD, GR / GV and VA Subaru STI, to run this valve
GrimmSpeed’s own top mount intercooler for the GD WRX and SG Forester XT is listed as the GrimmSpeed Top Mount Intercooler and Y-Pipe Kit for GD Subaru WRX and SG Forester XT
No tune is needed to run the Version 2 Bypass Valve for GD WRX, Forester XT, Baja Turbo and EJ257 STI applications
This valve does not fit the 2008-2014 WRX or 2005-2009 Legacy GT, which take a different GrimmSpeed footprint sold separately
The 19 psi leakage figure is from GrimmSpeed bench testing of stock EJ bypass valves

Frequently Asked Questions

Does a 2004 or 2005 Forester XT need anything extra for this valve? Yes. GrimmSpeed states that the 2004-2005 Forester XT needs an STI-style top mount intercooler before the Version 2 Bypass Valve for GD WRX and EJ applications will fit, and the same applies to every 2004-2006 Baja Turbo. The 2006-2008 Forester XT is listed without that requirement.
Does the Version 2 Bypass Valve for GD WRX and STI models need a tune? No. GrimmSpeed sets the steel spring at the factory, so the Version 2 Bypass Valve for GD WRX and EJ257 STI models runs on the stock calibration with nothing to adjust. Owners who later raise boost with a pro tune benefit most from its stronger seal.
Does the STI version reuse any factory parts? Yes. On the STI, the GrimmSpeed valve reuses the recirculating elbow from the factory bypass valve, which keeps the original alignment. Keep the elbow when removing the old valve, and the swap stays a bolt-in job with the original hose routing intact.
Will it fit a 2008-2014 WRX or a Legacy GT? No. The 2008-2014 WRX and 2005-2009 Legacy GT use a different mounting footprint, and GrimmSpeed builds a separate version for them around the same internals. This listing covers the GD WRX, EJ257 STI, SG Forester XT and Baja Turbo fitment only.
Why upgrade the factory STI bypass valve? The factory STI valve is a cast unit, and in GrimmSpeed testing stock EJ valves leaked internally from 19 psi, a level many tuned STI owners exceed. The GrimmSpeed replacement uses a billet 6061 aluminum body, Buna-N seals and a 38mm piston designed to hold roughly twice the stock pressure.

About GrimmSpeed

GrimmSpeed began in 2006 in a single-stall garage in Maplewood, Minnesota, porting and polishing Subaru manifolds. After building parts for several other makes, the company narrowed its focus back to Subaru, and its range now covers intercoolers, charge pipes, intakes, bypass valves, headers, up-pipes, catback exhausts, turbochargers, brake caliper kits, drivetrain mounts and titanium engine bay parts for the WRX, STI, Forester XT, Legacy GT, Ascent and BRZ, along with the Toyota 86 and GR86. GrimmSpeed engineers and manufactures as much of that range as it can in-house, and its front mount intercoolers are welded and inspected by hand in the USA.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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GrimmSpeed Version 2 Bypass Valve for GD Subaru WRX and STI, GR / GV / VA STI, and SG Forester XT

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GrimmSpeed Version 2 Bypass Valve for GD Subaru WRX and STI, GR / GV / VA STI, and SG Forester XT

Fitment and Installation

Features

Applications

Notes

Frequently Asked Questions

About GrimmSpeed

Reviews