I'm not horribly worried about it. There are a bucket of loopholes I can exploit if I can't get through "relatively" easily.
As to the turbo.. I have heard a lot of really good things so far. Granted 99% of my information comes from they having been installed in FWD cars so they may be tuned differently. But, like anything else, I'll jump that bridge when I get to it. In general, it's a "new tech" turbo so the rumors are that it's way bigger than stock, but has less lag along with more total boost.
My current Jetta now should be pushing about 170-180 hp. By estimations and dynos of other people with similar parts. It's driveable. It's no sports car, but it's driveable. It suffers from a WAY too small intercooler and the exhaust is way too small as well. The Jeep will not have those restrictions and the turbo is vastly superior as well as larger injectors. So I think my 200hp goal is pretty easily obtainable.
The performance of my Jetta is "useable", but if I cam mimic that performance in the Cherokee, I'll be a pretty happy camper!