aFe 49-36328-B MACH Force-Xp 3 IN to 2-1/2 IN 304 Stainless Steel Cat-Back Exhaust SystemaFe 49 36328 B MACH Force Xp 3 IN to 2 1 2 IN 304 Stainless Steel Cat Back Exhaust System Test results In testing, the cat back exhaust produced a max gain of +11 horsepower and +17 ft. lbs. of torque verified by aFe Powers in house dyno* (tested on 2011 BMW 335i N55) aFe power introduces the MACH Force XP cat back exhaust system for the 2011 2013 BMW 335i (E90 E92) with the L6 3. 0L Turbo N55. This system is constructed from 100% TIG welded, mandrel
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aFe 49-36328-B MACH Force-Xp 3 IN to 2-1/2 IN 304 Stainless Steel Cat-Back Exhaust System