Searching for a Billy Boat 2.7T Downpipe with Cat 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:

• Comes with:
• Set of 200 cell high flow metal catalysts
• 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. 

Note:

*Does Not Fit Automatic Transmission*

Emissions Disclaimer

• This product is sold for off-road use only.
• By purchasing this product, you understand this product is sold for competition use and is not legal for use in highway or street vehicles.
• The appropriate downpipe software is needed for this part or it will throw a CEL