I am supercharged and catless. Although I do smell the exhaust on cold starts, once it is warmed up I rarely ever smell it. I certainly don't smell like exhaust. You sound like you're either running too rich, or you may have an exhaust leak further upstream which may enter the cabin.
02 Carbon Black M3 6MT
456whp/312wtq @ 8psi, No #'s yet at 9.5psi
4.10 / Headers / ESS VT2-550+