I have a diesel grand cherokee.
It now sounds like one of the 80s mercedes cars with a diesel. Jeep has almost 50k on it.
When new it was quieter but I knew it would get a bit louder as it broke in.
I think its factory mileage paper said 24mpg, mine is an 07.
I can routinely get that kind of mileage out of it but I live in east tn and don't see high speeds much. Lots of 2 lane 55mph stuff out here.
If something less aerodynamic can equal or beat my mileage then I applaud it.
But I somehow just expect 20mpg out of some of that stuff in the links.
My jeep is stock. I replaced the tires before this past winter, put the exact same thing back on it because I ran into them at a nice price and I was more interested in good winter handling on the roads than anything else because I need to show up at my job.
One thing about the 250hp and 400ft/lbs of torque is that my jeep only has 215hp and 374 ft/lbs of torque so those numbers are not bad at all.
My grand cherokee has the same tow rating the hemi v8 grand cherokees got so I am pretty comfy with stuff in that power range.
As far as the 4bt being even louder, I would expect it and be fine with it.
I have never been a big fan of super quiet stuff. I prefer to know something is working and gassers get exhaust systems while diesels should be heard a bit and turbos should certainly be heard.
I think that the MB om617a 3L 5cyl turbo is a much more real world sane swap in a Jeep. But that's just me...