I have tested the H-B bars several times on both dirt and street. They absorb energy by flexing a lot and bending a bit. That is a good thing, but it does mean you may get little half moon indents on your valve covers where tapped by the bars. When I get home after
testing the bars I put them in a vice and use hammer and pry bar to get them close to original shape. Then I clean and touch up with spray paint. I don't even bother to worry about exact match color any more... they're just going to get scuffed up, again.