Little Advice?

[NeWbMuStangeR]

Hey, I recently bought a 2004 V6 Mustang and finally have enough money to start taking a lot of the stock stuff off of it. Mostly what I had in mind was the Exhaust System, and the Wheels and Tires.

But am having some problems getting started because I have never bought these kind of accessories and parts for a sportscar or even a Mustang for that matter.

I'm really concerned about the exhaust system for starters and would appreciate any advice considering what parts I would need, preferences of such parts and such.

For my Tires, I was considering rather large and thick width but am still very confused in which direction i'm going to go on those.

Thanks for any help lended, I appreciate it very much!