I just put a GT-Racing rear RSR style rear bumper on my SC. Right now I have it mounted only to the body, but intend to make some lightweight crush tubes out of thick wall PVC tubing and a piece of aluminum. On the front, I left the stock front bumper and replaced the lower valence with a "Euro" style valence. In the front, the bumper shocks are in place behind the aluminum front bumper. I decided to opt for more front protection at the cost of some weight.
front valence without fog lights (yet)
rear bumper mounting in progress.