i think i saw in another post of yours where you were talking about a similar topic. how you were straped for cash but wanted to mod anyways.... well first of all you should cancel that order on the header. the svt header is a very good design. if anything you can just get an off road pipe for it which will eliminate the cat. secondly, unless you chose to go the used route then i would suggest broweing the ff.com sponsers sites, they will tend to be your cheapest options.
also, btw this shouldnt be in the regional chat, this is more performance, or general car chat material.