TSP Hemi-Hellcat 2" Long Tube Headers With High Flow Cat Connection Pipes Engineered for serious Hellcat performance, these TSP long tube headers deliver maximum exhaust scavenging and horsepower gains. The 2" primary tubes optimize flow characteristics across the RPM band, while high-flow catalytic converter connection pipes maintain emissions compliance without sacrificing power. Precision-mandrel bent construction ensures consistent diameter and eliminates turbulence. Direct bolt-on fitment requires no modifications to your engine bay. Perfect for street or strip applications seeking reliable, dyno-proven power increases with factory-style integration.