I running a 225-40-18 with stock suspension still. I rarely rub unless i have about four people in the car like tricked96 mentioned with him. Anyways you will feel like your car is slower but thats just cause it takes more to turn them, you wont lose horsepower though. Trust me on this, 18's, if you get the right style look way better than 17's on a tour. I have Diablo Racing C-9s from dynamicwheels.com
You can see my car on the zetecregister on zetecinside.com
