Infiniti I30 car audio?

I know this is a kind of vague question but i have a 2001 Infiniti I30 and I want to upgrade my sound system from the totally stock one it came with. The only problem is I know close to nothing about what i need to put into it to make it completely bad ass. If you could just put a brief rundown of what I would have to change out and maybe some specifications of equipment that would be awesome. Let's just say that money doesn't factor in but don't go overboard. Thanks a lot.
 
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