Come on guys, lighten up a bit. If he wants to waste his money that's his business.

But.

Reza, generally it helps to be a bit more specific with your question. Figure out what you want to accomplish and form some kind of idea/plan/whatever that might do it for ya. If you say,

"I have 3 grand to drop, what should I do to make my car faster?"

You leave way too many things open to any number of possibilities. It's just too vague of a questin to answer.