This prevents our diverter valves suffering any of the failures associated with single piston and diaphragm type diverter valves. Gives you the sound you want, but keeps the performance! when increasing boost this is needed. The best choice if your looking to make your turbo spool quickly, have your car idle like it just left the factory, and you won't be tricking the mas air flow meter in between shifts, which leads to smoother gear transition
Fits evo 4/5/6/7/8/9
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