Originally Posted by lucad2
I understand the weight shedding and the mods, but as for maintaining how much annually am I looking at?
That's a very vague question, with no answer. Depends how many track days you're talking about, what kind of modifications you're doing.
Unless you're planning on getting into racing, just keep tracking your E46 M3.
Otherwise a "trackcar" is slightly useless. Just don't start throwing "track" parts at your street car. You'll ruin it in the end.