M5 E39

Hi People

I need help. E39 M5

I was racing some Renault Turbo thing a couple of days ago, and when I got home, well the thing happened. I fu..ed up my engine. As I stop at the electric gate, I was misfiring like there was no tomorrow with lots of smoke. There is a slapping noise inside the block, with lots of smoke at the back. I think I burnt a valve, but which ever way I definitely have a bend conrod, the way it sounds too me.

So now, is there someone out there that can overhaul this engine. Secondly, I would like too make it stronger. Can this be done.

Thirdly, plus minus how much am I in for.