Scorpion catback system made with T304 grade stainless steel, mandrel bent and TIG welded 2.5 " / 63 mm pipework for Audi RS4 B8 and RS5 8T. Fits from the catalysts and featuring active exhaust valves working with the OEM sport mode, this full system is a direct bolt on upgrade to install with OEM tailpipes ! Direct bolt on Valved resonated catback 100% T304 grade stainless steel TIG welded 2.5" / 63mm pipework Hardware included Instructions included Made in UK