Corsa 20-25 Corvette C8 3in Xtreme Cat-Back Exhaust 4.5in Pol Quad Tips - Integrates stock AFM ValveCORSA Performance AFM Only C8 Exhaust. The refined Track Series Exhaust. Like the CORSA performance C8 Track Series exhaust, this system is made for drivers seeking an ultra aggressive exhaust note without resonance caused by 4 cylinder economy mode operation . CORSA's AFM Only C8 cat back exhaust systems is designed to eliminate restrictions, maximize weight savings, and bring the noise while eliminating resonance from 4 cylinder mode. Each system