Ok, with all those news, I completely changed my mind. lol.

I'll stop thinking about upgrading my engine, and enjoy it until i'll buy the SRT6...

I might install lambo doors though...
I don't really like tuning, but here in france, the crossfire isn't know much... So i can do anything without telling i have done some tuning.

I think one lambo door kit is official for the crossfire, as i saw in this forum, but i'm not sure yet which one.