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2004 S4 4.2 Quattro Stainless Steel Exhaust |
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APR's B6 S4 Exhaust is offered as both a full
or as a catback system. The catback system is a complete stainless
steel, mandrel bent, cat-back exhaust. The exhaust is a dual 2.25"
system that begins at the factory downpipes and continues to an
innovative center muffler. The exhaust then splits and each mandrel
bent pipes goes to its own muffler with a 3.5" (90mm) bevel-cut,
round tip. A set of downpipes is also available for the 6spd 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.
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Cat-Back
System
