I personally love the quad setup for the look, regardless if M cars had it or not. @Sams mentioned Audi... they actually have quad setups on their S Line cars which are equivalent to 335i, 550i... and their RS line have larger oval dual setups, which I would probably also change to quad.
If your going all out and changing bumpers, fenders and badges to replicate an M, that's 1 thing, but changing an exhaust and maybe something else is simply preference.
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