I read an interesting artical in topgear magazine about stripping out the dead weight, they used a pug 207 GTI, ran round the track as standard and then striped eveythiing out and ran around the track again, result was exactly the same lap time, stig said that once the weight had gone it upset the balance of the car so it didn't handle well in the bends, hence the same lap time as a result, I know you can do a lot to change setup but only for track use you wouldn't want it set like that on the road. just thought it was interesting result as i automatically thought stripping out the weight would make it lighter and obvousily faster but i never thought about the unballanced handling!!