Complete Mk4 Cobra kit is $19,990. Not bad coin for a bad ass toy. No chance of inheriting someone elses problem car.

A4/6's aren't toys, but are you wanting to stance it like that? If so, get either Audi over the M3.

My crazy go fast days are over I've dumped too much money into cars and wasn't able to drive them every day and if I did go out I would be worrying if someone is gonna steal it and when I say toy car I mean something that is mine and can so whatever I want to it

If I found a great m3 at a good price I would turbo it and a set of wheels and coilovers maybe paint that's it or any e36 with a great body and do a ls swap

If I found an a6 4.2 great engine and price I would do a rs6 conversion and a 6 speed swap