for drag racing dont go to all the effort of remiving sound deadening and crap like that.

remome your spare tyre, tyre removal tools, and all the lining outta the boot of the car. that is about 15-20kg right there.

if you are serious about getting a lighter car (due to turning into a drag/track etc car)... should have got a Type R to start with. if you just wanna take it to the track a few times every couple of months.... remove the about items.