CORSA 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 has been Track-Tested and Dyno proven to maximize performance producing up to 19 HP and 16 LBS Ft. of TQ. All while shaving 25 pounds from the stock exhaust system.