The first WOT pull I did after uploading the revised tune was a little strange. Power felt more throttled back, and upon letting off the gas at the end the car let out a very loud burble/backfire (I assume right where the -10 timing correction is) and my wife behind me said there were 2 puffs of black smoke. Second pull had no issues (and I did 2 more but not proper from 3rd) and same for those. All felt a little bit slower than usual.