Black Mamba 2.5" (63 mm) Decat Downpipe for Audi A4 B8 and A5 8T 2.0 TFSI, manufactured using premium T304 stainless steel. Featuring mandrel-bent and TIG-welded pipework, this direct bolt-on upgrade connects seamlessly between the turbo and front pipe, optimizing exhaust flow for enhanced performan..