No check engine lights for me.

If you have a boost leak at the IAT sensor, that means you also have a vacuum leak there when not on boost. Maybe that vacuum leak and the exhaust leak are causing your errors.

Where exactly is your exhaust leak? And how was it found? Any tips on checking for exhaust leaks? I'm still a bit paranoid that I might have a non-obvious leak somewhere.

Once you get the leaks fixed, maybe you should follow this procedure to clear the adaptive memory and put the computer into "fast learn mode": http://www.quadratec.com/jeep_knowle...article-89.htm

One possibility is that it the computer has some calibrations stored in there that are now incorrect enough with the turbo kit to cause error codes. Details on adaptive memory and "fast learn mode" are hard to find, so it's unclear whether the computer would eventually "slow learn" new calibrations, or whether clearing the adaptive memory is the ONLY way to get the computer to re-calibrate.