i wouldnt rice up my teg maybe a r conver (maybe) but stock everything else, unless it actualy improves downforce and lowers weight (like mugen's windtunnel tested kits do) then i think they just really cheap made excess fiberglass some kits even add weight and hinder downforce and airflow. if i can find it i have a vid of a civic thats backbumper was so big that it caught air a riped off in a street race never felt the same about body kits after that