Greg, (or Gregg-who will certainly chime in soon),

Is there any data curently available which demonstrates a need for HNR in Production based vehicles which are required to retain the factory designed "crumple zones"? What about comparisions between the needs when driving an ITC Rabbit on Sebring Shortcourse, vs a tube frame GT1 at Daytona or Charlotte?

I ask because these two situations are extremely different in the amount of force, mass, and speed potential of each vehicle. Further, If the crumble zones are retained, such as in IT, or SS, wouldn't the theoretical G's experienced by the driver be substantially lessened.

In NHRA, Higher speed potential = higher level of safety equipment. This makes sense.

Just discussing, not being a Smrt A$$. I've wondered about this often. If I were racing a 700 hp Tube frame anything, I'm sure I wouldn't even ask this question.

Thoughts