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Forge Single Blow Off Valve And Hard Pipe Kit, Suits Bmw 335i N54 Twin Turbo

   4 Wheels - Road Tuning. Forge Single Blow Off Valve and Hard Pipe Kit, Suits BMW 335i N54 Twin Turbo. A Forge Motorsport Blow-Off/Dump Valve is designed to be an upgrade to the factory valve. Capable of dealing with higher boost pressures, more reliably designed. Forge also offer the option of an atmospheric valve on many cars. Uprated for higher boost pressures. Replace failure prone factory valves. Option of atmospheric blow-off noise. When you come off the throttle on a turbocharged car the built up charge of pressurized air has to go somewhere. If it can't, or if the air isn't ...