Originally Posted by ILC32
I don't know if you are in shape, but the most cost-effective thing to do is to reduce the weight of the driver!
Seriously though, IMHO wheels and seats are going to bring about the biggest weight savings.
Yeah, I have lost about 20 lbs since last summer. I was 6'-0" 200 lbs and now I'm very low 180s. Getting lean like that 4 liter!