F90 M5 Cen-Cal Valved Catback Exhaust - TitaniumBMW F90 M5 Titanium Valved Cat Back Exhaust S63 Sound Reimagined The F90 M5 is a twin turbo weapon trapped behind one of the quietest factory exhausts BMW has ever built. This titanium valved cat back wakes it up instantly. More presence. More tone. More personality. The way an S63 shouldve sounded the day it rolled off the line. Crafted entirely from Grade 5 titanium with true 3. 0" tubing and a forward large cross section X pipe, this system
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