The new and improved blow off valve system for the R56 Mini Cooper. For those looking at getting the top of the line system for your Mini Cooper S/JCW, this is the way to go. A high performance Blow Off Valve is needed. The Stage 2 BOV is made for the highest HP modded Minis. For street Minis use Stage 1. The purpose of the Riss Racing blow off valve is to relieve compressor surge without reducing compressor speed. It controls boost pressure that is built up by the turbo and vents it into the atmosphere when the car is not under load or in between shifts. This prevents pressure from backing up into the compressor housing, causing the turbo impeller blade to rapidly stop or spin backwards. Repeated stress over time can cause eminent damage to the turbo charger and eventually lead to turbo failure. The Riss Racing Blow off valve increase turbo life, performance, and response. For stock or aftermarket tuned R56 vehicles.

Riss Racing Stage II blow off valve system:

• 3 spring settings for highest boost holding capabilities

• Riss Racing polished finish with Riss Racing Logo

• Seal and greased for better performance and less friction

• Holds 20+ psi (depending on spring used)

• All kits include Riss Racing Boost box (additional tap to run BOV and/or Boost gauge)