I use them on my cars too. I also put a small spot weld on the tube and muffler to stop them from moving. A quick hit with an angle grinder is all it takes to separate them when needed.

1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)