I just finished installing AutoRust Technicians 2x2 SFCs last night. I had to slit the floor to fit them. They protrude 1/8" most of the way, just enough to be a nuisance. But they went in pretty easy over all, and I'd recommend them to others. The extra money spent to have them cut to length and contoured for the frame was money well spent IMO.

1971 Challenger