This is quite possibly the smokiest tuner I have ran in a duramax. I recently tried a quadzilla stealth 2 in my Lbz and of course couldn't resist the urge to try the 135 tune. It seems to make good power and Excelent fuel mileage if you keep your foot out of it(went from 12.5-13 stock to 16-20 on 135 tune) but it smokes so damn bad... I can step in to it while cruising along at 60 n let out a long cloud of smoke that blacks out the road. Am I gunna mess anything up in my truck doing this? Is the smoke gunna hurt anything? I think my tranny is handling the power very well after it relearned but I havnt abused it to much..