Searching for a Billy Boat 3" Twin Tips Cat Back Exhaust System for your 2000-2002 Audi B5 S4?  Nobody builds quality exhaust systems like Billy Boat.  Every one of these systems is hand built and forged from T304 stainless steel.  If performance is what you are after, B&B’s dyno results show an impressive increase in both power and torque.  It’s clear that a lot of time went into research and development. Not only is the performance phenomenal in this aftermarket part, but the aggressive sound is also excellent.

Specs:

• (2) 2.25" pipes that merge into one 3" pipe
• Polished muffler and tips
• 3.5" Twin ROUND Rolled-Edge Tips
• TIG welded fully stainless construction
• CNC hangers 
• All necessary gaskets included in all kits
• Reducer included: Allows the customer to connect their factory downpipe or catback to the B&B part. 

Exhaust Sounds:

Stealth System: Contains a muffler in the center midpipe for a deep unobtrusive sound. 

 *Note : Video is of Stealth System

S4 Launch Video: