I had to laugh when I first read of this new NHRA rule. But since then I have witnessed 2 Borla mufflers come off race cars going down the track. Didn't cause a accident but the cars did get upset buy running them over. I don't know if it was a bracket failure or a maintenance failure by not checking the bolt/nut. The tethers seem to be a little over priced, a couple of t-bolt clamps a foot of cable should be under 20 bucks, but then again, it's for NHRA safety rules.