Tires helped my ride on the SRT. It is a much stiffer ride than the N/A, but you didn't tell us what you have so we are just guessing at this point. No matter what, SRT or N/A, these cars are going to be stiffer than a normal ride. If you want a really smooth ride, find a smooth road or find a different car. You will eventually get used to the stiffness and you will appreciate it. It will come in handy if you ever have to take it through the twisties ;-)

Enjoy!!

RL