Perrin Recirculating Blow Off Valve Red 2015-2021 WRX / 2014-2018 Forester XT YMM_2012_FRS These one step colder plugs

These one step colder plugs are ideal for 2006-2014 WRX

They withstand high heat and pressure

this housing features a smooth taper inlet and large smooth bends that reduce flow resistance

The tank can be polished

preventing heat damage that can affect performance

Perrin Recirculating Blow Off Valve Red 2015-2021 WRX / 2014-2018 Forester XT YMM_2012_FRS These one step colder plugsPerrin Recirculating Blow Off Valve Red 2015 2021 WRX 2014 2018 Forester XT Adjustable Boost Control Performance Blow Off Valve Overview The Perrin Recirculating Blow Off Valve (BOV) is a precision engineered upgrade designed specifically for the 2015 2021 Subaru WRX and 2014 2018 Forester XT. It addresses a common limitation of the OEM blow off valve, which does not fully seal until around 3 psi of boost, resulting in lost horsepower and slower turbo