The COBB Cat-Back Exhaust System for the 2010-2014 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 10" resonator and COBB stamped mufflers. Aesthetics are improved from the rear of the vehicle with dual-walled 4" tips featuring the COBB logo.