I put 20" Boss wheels on my silver 4.6 (see Genesis pictures). There was no difference in the ride aside from the fact that it fells like it is on rails like my last BMW. What you can expect is shorter brake life but not that much. I put 20" Boyd Coddington wheels on my mid 60's car and it pounded down the road, but the newer suspensions are alot more forgiving. What you need to know is that you will have to get a wheel that clears the large front brake caliper. When you buy online you may get the offset and bolt pattern right but when you try to install them on the car they wont clear. You will notice the wheel I picked has the spokes join at the lip of the rim similar to the factory wheel and they just clear the brakes. No regrets on my purchase!!