"what does this for"? it supplies the electrical system in your car with better quality grounds. it is said to add about 5 hp and supposedly with the ground kit it doesn't put as much electrical drain on the car. for example your lights won't dim while putting up windows, they may go up quicker, and i think as the car gets older i would imagine that kit will help prevent bullshit CEL's due to bad grounds as the car gets older. there are directions for the install on the install section of this site and teamcelica.org. i want to do this, has anyone on here done it? and what do you think? -don
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