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You won't really void any warranty by messing with your exhaust setup and getting a CEL.
As far as adding an x-pipe to stock muffler, under load and WOT it is much louder than stock, but when cruising i'd say there's almost no difference in added volume (which is great) also no added drone.
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2009 E92 M3 | Alpine White | Black Extended | Advan RS | Turner Test Pipes | Dinan Axle-Back | OETuning | Eibach Springs | UUC SSK | VRS Front Lip | VRS Type I Diffuser | Matte Black | RPi Scoops | MS Filter | Yokohama AD08 | F1 Pinnacle
Special Thanks: Gintani | OETuning | eAs |