My county has decided to start doing emissions testing, so now I have to put a catalytic converter on my truck. I want a high-flow cat, but I don't really know what to look for. Do I need all the sensors and stuff or can I just get a universal 2.5" cat and get my muffler shop to run the pipes? What all is involved in putting one of these things on and making it functional? Also, I saw this asked in another post, but I figured I'd ask it here too: Where's the best place to buy one (cheapest) and what brands do y'all prefer?