This is the only surprise from media blast. Overall the cab is really solid. So nice that I felt bad cutting out the seat riser in preparation for my wise guys seat. I was going to buy a smooth firewall, floor, inner fenders from absolute sheet metal but no point fixing what ain't broke. This week I'm gonna buy some 18 gauge and fill holes. From what I've read, an LS1 should fit (tightly) without any modifications to the firewall, floor or inner fenders. So I'm going to run oem sheet metal for now and hope for the best.