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weight reduction is free. Just strip the car as much as you want. Also an aluminum driveshaft is a good mod, as is a lightweight flywheel and depending on how you use the car a lighter battery is nice too.
but it really depends on what you want to do with your car. People here mention sound deadening and the like and that to me is a waste of money, but I've been in a friends car who did a ton of it and he took the time to do it so well you literally could not even hear the windshield wiper motor. It was really amazing.
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