aFe Power Cat-Back Exhaust System(49-36121-B) 7101 Complemented by a front bushing

Complemented by a front bushing utilizing an oversized heavy duty crush tube

The kit includes an upgrade to APR Stage 3 software from a lower stage

AUDI B9 S4 S5

Unique Integrated Filter-to-Housing Design:

Full Sweep and Short Sweep Electric gauges

aFe Power Cat-Back Exhaust System(49-36121-B) 7101 Complemented by a front bushingMACH Force Xp 304 Stainless Steel Cat Back Exhaust System w Black Tip. This MACH Force Xp Cat Back exhaust system is constructed of 2 1 2" mandrel bent stainless steel tubing and comes complete with free flowing stainless steel, high temp black powder coated muffler, OE style bayonet hangers, band clamps and necessary hardware for a hassle free installation. The smooth curves and increased diameter of this exhaust system helps remove restriction and