Iv'e never actually bought any headers before, but i'm looking to do so now. I was just curious, if you buy an SLP exhaust system for example, is it best to buy the corresponding SLP headers? or can you buy any brand of headers you want (Kooks, mopar, etc) and put them along with the other brand of exhausts. Basically just wondering if you can mix and match headers/exhausts form different companies, and just get a shop to build you a Y pipe or what not to make them fit.