APR CD100008 Downpipes and Cats for Audi B6 and B7 S4 6-speed

The APR CD100008 Downpipes and Cats replace the 4-cat factory setup with a pair of metal matrix catalysts. In testing, a full APR exhaust produces gains of 25hp and 35lb-ft across most of the engine powerband. Throttle response is also greatly improved. With TIG welding, fully stainless mandrel bent construction, and CNC'ed hangers, you will not find a higher quality system on the market.

Note:
APR CD100008 Downpipes and Cats are designed to fit with an APR catback system, other exhaust systems may require modification to fit. The APR CD100008 does not fit Tiptronic equipped vehicles.