GrimmSpeed started from the ground-up design with the valve body and base for each popular fitment. Both are CNC-machined out of billet 6061 aluminum alloy for its strength and light-weight. They are then anodized in either a black or red finish to give them a brilliant appearance, provide corrosion resistance and match other GrimmSpeed offerings. Compared to the plastic construction on both the 2008-2014 WRX, GrimmSpeed Bypass Valves not only stand out, but are guaranteed to stand the test of time.

For the internal components of the valve, GrimmSpeed chose to utilize a machined brass piston for its anti-corrosion and low thermal expansion characteristics. Our piston seats onto an internal O-ring to create a perfect seal, eliminating boost leaks common in OEM and cheap aftermarket BPVs. In order to make sure this could keep up with high power levels, a massive 38mm diameter piston/sealing ring is used to dump pressure quickly. This is especially important on high boost applications to keep the turbo from sustaining damage and the BPV maintaining leak-free operation. A precisely-tuned steel spring alleviates the need for any tuning or adjusting of the valve, with no engine tuning required to run the unit. Buna-N O-rings were the next logical choice due to their resistance to degradation from fuel and oil exposure. In addition, all the O-ring grooves utilize a single dovetail design for superior retention. This guarantees the O-ring will not fall out and has the perfect crush for sealing the body together. To top things off, the valve employs a swivel fitting for easy installation and to accommodate best-routing on custom setups. A GrimmSpeed signature branding badge graces the top of each unit so that everyone will know you chose the best valve in the biz.

Note! The larger-than-stock size of this valve means it will NOT fit on the stock intercooler without customizing/modifying the stock intercooler bracket.