My mods are CAI, off road x, flowmasters, and a tune. When I shift (rather slowly - don't care to be banging gears) on WOT often my Cobra will hesitate for a split second and then nearly give me whiplash. I used to think this was it building boost again, but after looking around this seems like the fuel issue that many people talk about and do the PPRV delete for. Should I contact my tuner to help the problem or do the PPRV delete or is this something else? THe PPRV delete issue seems to happen when the fuel pumps are under heavy load and I find it hard to believe that mine are with it running at stock boost levels.