SHyan
your TSB will be wiped out when you download the powerpup. If you go back to the dealer to attemp to re-enable the TSB the techs DRB will show that it is already enabled. It will also show codes indicating a re-flash and in my case a comunication error. This could also jepordise your warranty if you are concerned about that. The powerpup has a copy of a stock program built in. It does not copy your stock program. On the other hand you may get some MPG improvments on one of the lower settings. I don't think much of bullydog as a company but if you want to try the powerpup why not try it before you get the TSB and see how your MPG goes.