I'd say if NHRA would look into the SFI specs as to why Mild Steel chassis can't go at least 6.50 - 7.0 they'd get a lot more cars.
As has been said a million times SFI requires NASCAR chassis to be Mild Steel, and they crash all the time.
Personally I only know one car in T/S that is mild steel.
It is even older than mine, and it is because of cost.
They would probably not be in T/S without a car that old & cheap.
My car is old because I'm old and have been running the same car for a very long time.
It was a NHRA P/S that aged out and was modified for A/PM.
Would there be more guys interested, probably, but many of them can't afford to run quicker than 7.50's anyway.
These guys I mentioned are in the high 7's and have been for many many years.
When I started there was actually a bunch of actual street cars running in T/S.
Some with a back half or partial chassis.
I even ran my old US Navy daily driver saturday at a T/S event because my Pro car is getting an engine change.
An actual GM car car with a cage, not even a back half or partial chassis.
I've also said many times after learning that nascar uses mild steel.
WHY.
Why are they allowed to use mild steel in 200 mph cars heavier than ours, that end up in horrific crashes.
Our design is also pretty damn substandard.
I looked at several cars Saturday because of the death recently of our T/S brother.
The F/C cages are ridiculous.
They are not deep enough or enclosed enough to keep us safe.
My F/C cage is much much much more substantial than every car I saw.