Precision crafted from 100% T304 stainless steel Billy Boat Performance Exhaust’s for the B8 A5 Audi is in a league of its own. From the CNC mandrel bent 3” tubing to the straight through design muffler’s which incorporates B&B’s unique Purge Resonance Technology (PRT) this cat back system gives the A5 a nice sporty exhaust note acceleration, a pleasant touring note while cruising with no interior drone while still increasing horsepower and torque. For aesthetics Billy Boat Performance Exhaust uses a pair of their eye catching 3.5” round double wall tips that give the A5 a bold yet distinguishing look. The mufflers and tips are fully polished to a mirror like finish. This bolt on system and hangs in the factory hanger and is backed by a limited LIFETIME warranty.