Integrated Engineering Cat Back Exhaust System - Audi S4 B9/B9.5 3.0T PORSCHE_991.2 Damper settings for very sporty

Damper settings for very sporty handling in any situation on the road or track

Remote fill neck installations on FCST-X surge tanks

Interactive Engine Dyno Charts:

which completely hides under the intake and out of view

Verify your valve cover code before purchasing — not all K-Series valve covers are compatible

Integrated Engineering Cat Back Exhaust System - Audi S4 B9/B9.5 3.0T PORSCHE_991.2 Damper settings for very sportyThe IE Catback Exhaust System for your Audi B9 B9. 5 S4 incorporates our in house engineered DroneTrap technology to deliver a truly aggressive exhaust note without any annoying drone or rasp. Engineered with cutting edge design features, including mandrel bent stainless steel, TIG welding, multi point reinforcements, and oversized quad tips. Experience the elevated and enriched sound your S4 deserves. IE's advanced DroneTrap technology captures the