Wagner Tuning Catted DownpipeDownpipe Kit with 300CPSI Racing catalyst for Audi S4 B9 S5 F5 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 optionally also available with 76mm (3 inch) middle silencer
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