A set of downpipes is also available for the S4's. This system replaces the 4-cat factory setup with a pair of metal matrix catalysts. APR downpipes will only fit with an APR catback system. 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.
This Exhaust System Fits: B6 Audi S4 Quattro (6 Speed) B7 Audi S4 Quattro (6 Speed)
"Haven't drained it yet so I don't know how much blow by it's collecting, but it looks nice in the engine bay and my idle feels smoother than before when I was just running a BSH block off/guidance pla..."
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