The Stealthback Exhaust for the 2013+ Hyundai Genesis Coupe 2.0T is a two (2) piece system consisting of the Front Pipe/O2 Housing (GC13-FP) and Race Pipe (GC13-RP) connecting the turbocharger outlet to the factory catback exhaust system. The Front Pipe/O2 housing has a huge cast 304 Stainless Steel upper section tapering to 3 inches at the outlet. The Race Pipe is made from 3" diameter mandrel bent 304 Stainless Steel polished to a mirror finish. The Stealthback Exhaust gives you the high flow needed to turn your car into stealthy lurking beast without the additional noise found in a Full Turboback System. To obtain optimal power we removed both catalytic converters to reduce all restriction. As with any modification that removes these items it is likelyy to trigger a Check Engine Light.