The AWE Track Edition exhaust for Audi B9 S4 is a non-resonated package with non-resonated downpipes and straight pipe sections, leaving the x-pipe as the only filter for a notably loud, aggressive note. It comes with 102mm double-walled adjustable tips in Diamond Black and is handcrafted from T304L stainless steel. The direct bolt-on system claims up to 16 hp and 17 lb-ft at the crank and is not returnable for sound preference.
AWE Tuning Audi B9 S4 Track Edition Exhaust - Non-Resonated (Black 102mm Tips)