Billy Boat has released their 2010-2015 B8 Audi S4 System. Manufactured using only the highest grade T304 stainless steel materials available the full 2-1/2” system is a direct replacement for the restrictive factory system providing increases in both horsepower and torque.

Hand fabricated mufflers incorporating B&B’s unique Purge Resonance Technology (PRT) give the S4 a distinct exhaust note that is louder than the stock yet pleasing to the ear.

To finish the system off B&B uses a quad tip design using 3.5” round double wall tips for a look that is pleasing to any enthusiast’s eye. With the system being an after cat design it is 50 state emissions legal and is backed by B&B’s limited LIFETIME WARRANTY.

Stealth System:

Billy Boat Performance Exhaust offers a stealth system that includes a center resonator to give the car a deep unobtrusive sound.

Catback Includes:

• Center Muffler section
• Driver Side Muffler Section
• Passenger side muffler inlet pipe
• Passenger side muffler section
• (5) Clamps 
• Reducer included: Allows the customer to connect their factory downpipe or catback to the B&B part.