I burst my tailpipe right before the muffler on my '71 200i6 doing that downhill. Have since gone v8 and not tried it again.
Mavmanerick, As an older (31) wiser member of the board I feel it is my duty to tell you that you are not mature enough to own your Mav and you must send me the title and car immediately. J/K LOL Hopefully you can wade through my sarcasm.
We used to call it "key-banging". We had a 70 Ford Ranger pickup company work truck.It was a 6 cylinder/ 3 speed stick and was beat upon mercilessly. Very loud backfire, and yes, it was amazing that the exhaust stayed on that poor thing. This truck belonged to a Goodyear dealership, and frequently driven by mechanics who would shift w/o using the clutch and other horrors of intentional abuse. They let it get so bad, you would have to pump the brakes three times to stop it until I refused to drive it anymore. I always liked that truck ... If I ever need a pickup, and could find one of these, I'd be tempted. Great styling, short bed, and proven indestructable by experts. lol