One more variable to include in the mix: I have an exhaust leak.

Here, you can see me exposing the leak by blowing air INTO the tail pipe with a shop vac (hose partially duct-taped onto the tail pipe, but not fully sealed), then spraying soapy water on the welds of a pipe:

https://www.youtube.com/watch?v=nIcUSUdGKgc



That is a pretty significant leak right next to the O2 sensor, so it is possible that it's causing some slightly false readings at certain rpm ranges if fresh air gets sucked in through those leaks.


Good news: Prodigy is replacing this pipe under warranty.

It will be interesting to see if my hesitation issues become less of a problem after getting rid of that leak. From talking to other people with the turbo kit, I get the feeling that my complaints are exaggerated compared to theirs. This leak could possibly explain that.