Audi S4 / S5 B9 Armytrix Decat Downpipe

Made from high quality T304 stainless steel available without specific treatment or covered with a ceramic coating to limit thermal propagation, this Armytrix decat downpipe intended for the Audi S4 / S5 B9 offers a particularly aggressive sound and a significant power gain. With a 2x63.5mm / 2x2.5" diameter, this downpipe is equipped with a cat simulator to prevent check engine light due to standard catalyst removal.