Searching for Billy Boat Downpipes W/High Flow Cats for your Audi S4? Billy Boat is synonymous with quality in the Audi aftermarket product space.  You could go cheaper, but you won’t get the quality you would from a brand like this. Each part they make has been scrutinized in research and development.  Performance is paramount but the aggressive sound is nothing to forget.  B&B starts from the ground up when building a part.  They create their products form T304 stainless steel and are proud to guarantee a lifetime of performance.

Specs:

• (2) Includes two down pipes
• Features integrated flex joints
• High-flow catalytic converters
• Reducer included: Allows the customer to connect their factory downpipe or catback to the B&B part. 

*NOTE*: These downpipes are only bolt-on with the APR or B&B cat-back systems. All other cat-back systems may require fabrication!!

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