Looking for a Billy Boat 3" Twin Tips Cat Back Exhaust System for your 2000-2002 Audi B5 S4?  Turn some heads with a show quality product you won’t be sorry you got ahold of.  Billy Boat is known for quality.  They guarantee their products performance for a lifetime, because they build their products out of high-quality stainless steel.  Billy Boat meticulously creates each product by hand, assuring that your product is the best it can be.  As far as performance goes, Billy Boat has tested this product’s performance with an in-house dyno.  Both torque and horsepower increases were evident within the entire power band.

• (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:

Sport System: Replaces center muffler with a smaller resonator for a more agressive sound 

*Note : Video is of Stealth System

S4 Launch Video: