ok my truck is pushing close to 850HP, and still idles close to stock, but if you really wanna make it lope, its gonna make your truck hard to drive, and you might have to feather the trottle at lights, but 150HP injectors and crossover tubes should do it. Good luck. would also like to point out that black smoke, its just unburnt fuel, the less you smoke, the more of that fuel you are actually using, so woot blow that money out your tailpipe.