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so... looking at it; the stock has front cats (after headers), rear cats (part of xpipe) and resonators (part of xpipe). Right ?
How much does the sound change with just xpipe and resonators like the Autowerks one, but keeping the front cats and rear end stock ... and does it throw a code if you remove the rear cats?
Thanks!
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2009 E92 M3 6sp manual - stock
2008 335xi sports package 6sp manual ; Helix stepped intercooler, M3 steering wheel, ZCP M3 shifter, Eibach sport springs, Bilstein B8 shocks; Rob Beck stage 2 turbochargers; MHD stage 2.
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