IDK man. My 1SS 1LE soaks up bumps better than my wifes Taurus SEL, and it's a pretty decent riding car. If it's on a road with old pavement that has a constant rough texture to the surface (it males a bbbrrrppp noise while driving) my wifes car is more comfortable, but the MRC definitely does a very admirable job of soaking up sudden impacts and bumps. My car is the only GEN6 I've ridden in, but I've always heard that even the non- MRC setup is a reasonably smooth, and not harsh ridding car.
Does the non-1LE SS car come from the factory with the lifting blocks on the front springs? IDK if that's been mentioned yet and I don't feel lile reading thru 6-7 pages. If it does (which I don't think it does as you don't have a big splitter to clear) that would be the most likely culprit.
If you car has these orange blocks on the front springs then you should remove them as they're only there to lift the front of the car an inch or so, so that the front doesn't scrape when load/unlading from the transport trailor. They're not supposed to be used for anything else and the dealership is supposed to remove them when the cars are unloaded. They often don't though.
