Seems most of the pace cars I have seen have rear bumper guards on them. I don't have the bumper that came on the rear of mine, I used another one with the bumperets. Are bumper guards standard on Z11 or optional? If optional are they coded on the firewall tag and what's the code if so?

Optional and not coded anywhere but a build sheet.

Thanks, that's what I needed to know - now just need to decide which way I want to go.