so you want to get a vortech supercharger AND a turbo or a vortech supercharger OR a turbo?
but back to the original post....
chances if you are gonna buy a kit off ebay it's a knockoff. knockoffs are cheap plain and simple. i can get a complete kit for 400 bucks locally, that's for just about any if not every kit consisting of a front bumper, sideskirts, and a rear bumper. BUT they are knockoffs, they may look the same but they aren't made as sturdy as the real deal might be. the only reason i would buy a kit off of ebay is if i lived somewhere where obtaining a kit is difficult, not to beat prices because shipping is always killer.