Let me give you my 2 cent experience with d-loops. Drag racing in the lat 80's I broke the front yoke at about 75 mph. It totally demolished the turbo 400 tail shaft and broke the mount dropping the engine and trans down; it ripped the Lakewood flat strap style loop out of the floor (bolted in the stock floor pan of my 67 Firebird). Luckily I was not hurt just my wallet. In 2002 racing the same car I broke a driveshaft at 160 mph. I had a tubular front loop and it was destroyed. The shaft can openered the floor but a double frame rail next to my leg saved me from major bodily damage. 3/4 of the shaft exited out the back of the car. The noise was horrendous and after that day I installed a full 4130 enclosure that went from front yoke to the rear yoke in addition to front and rear loops. Do not skimp on the loop!
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