120 hp is all that I run. I do have a 5 inch turbo back exhaust and the BD exhaust manifold. Never had any problems. Would not suggest without an after market exhaust.

Hey guys this was the best 300 dollars I ever spent except for the predator. I was only getting 19 mpg onn my 06 gmc sierra 2500hd short bed with 4 wheel drive using the 120 tune. I installed the BD exhaust manifold 3 months ago and now I'm getting 23 mpg. Maybe you should try it on your vehicles.

I had the same problem once. There was a fuse under the hood that was blown that powers the obd plug in the truck. Don't remember what it was labeled as.

Is the new update for the u7186 strictly for the new lmm or is there useful settings for the lly-lbz.

Transmission will not shift into third if on gas hard on 120 setting on 7186 with recent update. Have to let off gas before it will shift. any suggestions?