Toxicity

I have an exhaust system in mind, and would like to know if it will work. I was thinking Long Tube headers (whats a good brand, and anywhere I can get for great prices?), Pypes O/R H, and Pypes Mid Muffler cat-back. Will that work? Is the Pypes O/R H compatible with Long Tubes, or do I have to get a different kind of O/R H (I would prefer H over X)? What other things will I have to buy for the install (mil eliminators?)? Thanks for all the info guys!