CATBACK, S4/S5 2018 3.0L TURBO AT/MT AWD 2+4DR 2.5" "S-TYPE"

System includes electronic exhaust valve simulators which ELIMINATE the valves. This avoids any warning lights on the dash while providing maximum flow at all times. BORLA® Cat-Back™ & Axle-Back exhaust systems feature patented straight-through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA® Sound of Power respected by motoring enthusiasts everywhere.

Each system is built from premium, high-quality T-304 austenitic stainless steel, superior to T-400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer-controlled CNC manufacturing ensures an accurate fit.