Used to do the shut off and coast in gear thing also. My Thrush mufflers were basically two hollow cans with the bottoms out of them, bolted to the header flanges.
Yea we did this a lot at 16. Blew a new muffler up and took it to the parts store I dealt with. Tried to tell him it was defective as it split in the seam. Just looked and shook his head gave me a new muffler and said don't bring it back again. No more of that crap. LOL :oops:
