For the true hardcore enthusiast Billy Boat Performance Exhaust developed a full 3” cat back for the Audi TT 225 1.8T that just says performance. Precision crafted using 100% T304 stainless steel, CNC mandrel bent 3” tubing throughout the entire system along with B&B’s proprietary Purge Resonance Technology (PRT) design mufflers this system offers a smooth uninterrupted exhaust flow for increases in both horsepower and torque along with a deep, rich exhaust note. The PRT is simple in design yet unique in theory so you can have a deep hard-hitting note on hard acceleration but still a mild tone while cruising without the unwanted resonance. B&B uses their bold yet stylish 4” round double wall tips finish off the system for a individual look. Since no engine management sensors are moved or altered this system is 50 state emissions legal and is backed with their limited LIFETIME warranty.