The factory exhaust system on the GTS 4.0 subdues the mechanical resonance of the naturally aspirated flat-six. The standard catalytic converters and petrol particulate filters restrict exhaust gas velocity, limiting potential power output. Replacing these restrictive components with high-flow Exhaust Downpipes or aftermarket Exhaust Manifolds/Headers significantly improves gas scavenging and throttle response. Pairing this upgrade with a Cat-Back Exhausts system fundamentally alters the acoustic profile of the vehicle, restoring the authentic Porsche wail. We also stock Misc Exhaust Parts, including the necessary clamps and hardware for precise fitment.