Forge

Forge BMW N54 Chargepipe with BOV (1M, 135i & 335i)

Finish

Black BOV Purple BOV

Spring

Yellow Spring + 15.65mm Shim (-8 PSI) Yellow Spring + 6.5mm Shim (-6 PSI) Blue Spring + 6.3mm Shim (-10 PSI) Blue Spring + 10mm Shim (-11 PSI) Red Spring Only (-12 PSI)