so i have a 2003 silverado (http://www.dieselplace.com/forum/showthread.php?t=291113#) with a 5 inch mbrp exhaust and a diablo sport tuner set at 85 hp!. well since i put a lift and 37s on my truck all the black smoke i used to push out is pretty much non-existant, and i want it back lol. any ideas!?!?!?!?!