heavy gun E46 M3

Hello guys, summer looks pretty bad for me buddy picks up the E46 M3 The thing goes hell. So far I was able to annoy him (E36 M3) with my TT well but now…… I can’t think of anything anymore and it’s absolutely not 10000 € for a conversion. So as an allternative a RS4 is a good or bad thing but the consumption is really bad. What are your experiences about M ́s