I was wondering if anyone had a tune for a turbo'd 5.3 that i could get and use as a base to work off of..We are trying to get the tuning done on this thing w/hp and we are VERY new at this....Any help would be appreciated..It is backfiring right now after going 50-60% throttle the truck begins to backfire some and looses some power...It is currently at 10 psi but the roads are wet and we cant get above 5 w/out lighting the tires up, its cool out and he has a big intercooler and AITs are staying around 55-65. We are running 22* timing and seeing no knock retard.