Turbo XS 08-12 WRX RFL Blow off Valve BOV

With new and improved styling, the Type H-RFL BOV remains true to it's roots - it's still really f'n loud! Like all Turbo XS valves, the RFL relieves compressor pressure surge caused by changing gears or backing off the throttle and has been used on turbo charged engines running upto 35 psi boost. If you need to ask how loud it is, this valve is too loud for you! Type H-RFL Blow Off Valve comes standard with both a mild steel and aluminum weld-on adapters. Bolt-on kits are available for most OEM turbocharged applications.     VEHICLE FITMENT 2008-2014 Subaru Impreza WRX H4.2458cc Forced Induction::Blow Off Valves 2010-2014 Subaru Impreza WRX Limited H4.2458cc Forced Induction::Blow Off Valves 2009-2014 Subaru Impreza WRX Premium H4.2458cc Forced Induction::Blow Off Valves 2008-2014 Subaru Impreza WRX STI H4.2458cc Forced Induction::Blow Off Valves 2011-2014 Subaru Impreza WRX STI Limited H4.2458cc Forced Induction::Blow Off Valves 2010 Subaru Impreza WRX STI Special Edition H