Forge Motorsport Single Piston Ram Dump Valve Colour:Polished Silver which is exactly what the

which is exactly what the Forge Motorsport intake does

All types rely on an internal spring in order to maintain a seal so that you have boost pressure when it is needed - If the spring is too weak

If you are unsure which version you require

4 MultiAir Actuator Unit

Forge Motorsport Single Piston Ram Dump Valve Colour:Polished Silver which is exactly what theWe recommend servicing your valve every 3 years, or 20,000 miles, whichever comes sooner An Atmospheric Dump or Blow off valve suitable for all turbo cars without an Air Flow Meter. Made from billet alloy and using a single piston this valve will run faultlessly without the need for attention and eliminates the longevity problems associated with the original diaphragm valves. Single Piston Diaphragm Atmospheric Valves and Valve Fitting Kits. All Forge