VOLKSWAGEN STAINLESS STEEL CAT-BACK EXHAUST (MK8) GTI5V4100 SOUND CHECK DESCRIPTION The COBB Cat Back Exhaust System for the Mk8 GTI is a direct replacement for the factory exhaust. It comes with an adapter that tapers down to be used with the factory downpipe or can be used without the adapter and bolted directly to the COBB 3" downpipe. Engine resonance and turbo noises are amplified but still kept in check through the 18" resonator and 12" COBB stamped muffler. Aesthetics are improved from the rear
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