Catback Exhaust System – Audi S4 B5 2.7 BI Turbo 97-01
2.25" Bore Throughout With Twin 3" Tailpipes! A free flowing exhaust is a great way to get the best out of the BI Turbo Engine Fits from the catalytic converter back Manufactured from Mandrel bent T304 grade stainless steel Engineered to improve throttle response and increased power and torque across the entire RPM range