@ralatorre9 No brainer for me as well. Bolt ons and tune, 500rwhp for maybe $1500. No BMW tax on mods or parts. I like M3s, but not enough to justify the choice of an E46 M3 over an 03-04 Cobra. Or even a 96-98 Cobra, for that matter.
@KarstonLikesMustangs That's not true at all. 4 O2 sensors. The back two just determine if the cat is working. They're worthless otherwise. Front two do all the heavy lifting.
@DirtridinElCamino Not much different than stock.