The long-awaited return of the GrimmSpeed Bypass Valves is here! Our valves have been a highly sought-after product, but due to the intensive assembly process, it has been hard to keep them on the shelves, which in turn causes frustration among our customers. To address this issue, our team has worked diligently to redesign the BPV to make the assembly process more efficient, while also improving its manufacturability, performance, and overall reliability.
 
What's New for Version 2?
GrimmSpeed V2 Bypass Valve 4-21 Subaru STI 02-07 WRX Redesigned the internal piston to eliminate the potential failure points we saw in our V1 design.
Adjusted tension of the internal spring to better suit the operating environments we've seen after further testing and development.
Updated the design of the main body for a better CNC milling finish.
Exchanged the internal brass piston from V1 for a lighter weight hard aluminum piston, resulting in better valve response.
Removed the inspection port which was primarily used for quality control, but it is not required with the new design.
 
FITMENT:
2004-21 Subaru STI
2002-07 Subaru WRX
2004-08 Subaru Forester XT (2004-05 FXT require STI-Style TMIC)
2004-06 Subaru Baja XT (requires STI-Style TMIC)
 
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