[terry1]

I sent a couple of pictures of my set up, exactly the same as yours, to NHRA in Cali, three or four years ago.
They said no tethers required. I have a copy of the letter from NHRA, and my pictures, in my trailer at all times.
The only question I was ever asked was if my collectors are/were welded to the headers
which I answered yes.They didn't ask about extensions!They never even looked.
Terry K