CORSA Performance C8 4 Valve NPP Exhaust. The Ultimate Driver's Exhaust System. Total Control. Incorporating the latest technologies from CORSA Performance, our 4 Valve NPP C8 Corvette exhaust system features valved sound control, paired to our most advanced RSC(R) No Drone Technology to deliver complete control of the driving experience. Each 4 Valve exhaust system features CORSA's exclusive cast valve assembly completely redesigned to meet the intense heat needs unique to the C8 Corvette. Valve assemblies mate seamlessly to the stock actuator motors allowing the driver to maintain all C8 driving sound modes without throwing a Check Engine Light. Both Louder (+9 decibels) and quieter (-1 decibel) than the stock system, the C8 Performance exhaust unleashes exhilarating exhaust notes from the 6.2L LT2 engine with the refined driving experience only a CORSA exhaust can provide.