aFe ATLAS 5 IN Aluminized Steel DPF-Back Exhaust System w/Polished Tip (49-04040-P) 1532 2 2005 Audi S4 Engine:

2 2005 Audi S4 Engine: 4

The CNC formed pipes ensure the best possible flow for horsepower and torque

Direct replacement for OEM muffler works with stock cats and fabspeed's catbypass pipes

In the previous model

aFe ATLAS 5 IN Aluminized Steel DPF-Back Exhaust System w/Polished Tip (49-04040-P) 1532 2 2005 Audi S4 Engine:Atlas Aluminized Steel DPF Back Exhaust System with Single Side Exit (49 04040 P) by aFe. Exhaust System Type: DPF Back. Exhaust Tubing Material: Aluminized Steel. Main Tubing Diameter: 5". Exhaust System Sound: Aggressive Loud. The ATLAS Exhaust System channels the exhaust from the engine to the rear of the vehicle on a racing diesel engine truck. It has the least amount of exhaust flow restriction possible to enable the engine to make more