A direct bolt on upgrade for the Billy Boat Performance Exhaust cat back these downpipes eliminates the restrictive 4-cat factory setup with straight pipes. Benefits of the done pipes are improved throttle response along with the increases in power throughout the entire rpm range. *THESE UNITS ARE DESIGNED FOR OFF-HIGHWAY RACING ONLY AND SHOULD NOT BE USED ON PUBLIC ROADS*
Billy Boat downpipes will only fit Billy Boat cat-back exhaust systems. In testing of the full Billy Boat full exhaust system, it produced gains of 25hp and 35lb-ft across most of the engine power band. Throttle response is also greatly improved.
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Manufacturer | B and B Exhaust |
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Engine | 4.2L |
Make | Audi |
Model | S4 |
Year | B6 (04-2005), B7 (05-2009) |