Right now I have some heavy ass 17's on my car. Since I want to go fast more then look cool I want to change to lighter 15's. I currently have RSlimited Elite wheels that weigh I think like 20-21 lbs. I am thinking of buying some Rota Slipstreams with weigh like 11.5 lbs. I am planning on doing this no matter what but I am curious to know how much of a difference I will see as far as my 1/4 mile time. Any estimates are appeciated. Thanks.