The AAM Competition 3.0TT Q50S Resonated Lower Downpipes have been engineered as a directly replacement for the lower portion of the OEM downpipes. The AAM Competition 3.0TT Q50S Resonated Lower Downpipes vastly improve exhaust flow by eliminating the bulky and restrictive catalyitic converter found on the factory lower downpipe. The resonators keep exhaust drone to a minimum while increasing overall performance