Black Mamba 5" (130 mm) to 3.15" (80 mm) Decat Downpipes for Audi RS6 C8 and RS7 C8 4.0 TFSI, expertly crafted from T304 stainless steel with handmade TIG welds for optimal durability and exhaust flow. This direct bolt-on upgrade eliminates the restrictive OEM catalytic converters, delivering a prov..