I just installed my TST (w/original twins program) today. What an impressive unit. Talk about a kick in the pants. This thing gets you up and moving. IT"S AWESOME :-laf . One thing that I was informed with the twins program upgrade is that it allows your truck to dump more fuel early so a person can throw a good cloud of smoke. I have read that alot of you with a tst have been able to throw a serious cloud of smoke. This has not been the case for me :{ . I have had my box on 3/3 (since I still have a stock turbo and transmission) and my truck doesn't throw any more smoke than it did being stock. I'm very disappointed in this area. Is it because I have an auto instead of a manual? I installed everything that came with the kit exactly the way it said to, but no smoke. I know that this box is made to give a person the power, but the smoke would be nice. Anyone with suggestions on how I could get the smoke or why I'm not getting it. Love the power, but want more SMOKE!