Actually, I don't think changing to the 18" rims caused me that great of a drop in power. It all depends on the rims you get. I got the lightweight Racing Hart Rims. Looking at the power, our cars are rated at 130 HP at the flywheel. Figuring around 20% loss going to the wheels, we get 104 WHP, plus or minus. I dynoed my car with the 18" rims (NO OTHER MODS) and got 100.0 WHP. Yeah, our cars are a bit underpowered, but with all that is available at this time, and what will be available very soon, the power can be bumped considerably.