I'm going to be doing Stillen Long Tubes here in the next few years. I have an aftermarket exhaust with stock y, cats, and resos. i have purchased a new y pipe to put on my new muffler since the stock one kinda sucks, (sticking with the 2.25" B Pipes and 2.5" muffler) but i still need to find some b pipes with high flow cats. I need some guidance from all those with headers. TooManyMods, who did yours?