Audi S4 B9 300CPSI EU6 Downpipe Kit

Downpipe Kit with 300CPSI Racing catalyst for Audi S4 B9 3,0TFSI made out of high quality stainless steel 1.4301 (SS304) complete 2x ?3 and adapter for stock exhaust CAD designed and flow optimized 300CPSI with EU6 coating Racing Metal Catalytic Converter 100% perfect fit, replace OEM less thermal load on the turbocharger more power by reducing back pressure significantly more torque Error display in the DME possible.