I decided to just stay with the original rims. I am running plus size tires on the rear. Thanks for the picture of your car.

Natemo

 

OK in the rear the limit is the rear tire needs to be less than 27" diameter (285x35x19 us 26.9"). The clearance issue is the front lip of the wheel well when the rear tire is dropped as far as possible (suspension geometry moves tire forward as it drops.


Second, in general the lower the profile the stiffer the ride. To compensate you need a softer suspension (one reason why "bagging" is popular).


For modelling different combos, this site is very handy.