Ok iam lookin at this silver 99 z28..it has the chevy ground effects kit with that ugly 3pc spoiler...if i take that spolier off and the sides that are on the quater panels will it leave marks? and if i take the bodykit off will it have marks on the body?

 

the "ugly 3pc spoiler" is mounted to the body, so yes you're going to have holes left over. The bodykit shouldn't be as noticeable, I'm not firmiliar with how the factory installs it but I thought it was mostly held on by double sided tape.