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Just put some on my y-pipe today. No loctite is needed.

Not cheap though. I think a bag of 25 washers was $10 at Fastenal.
Chuck, cool you found these washers.. We use these at work for special G-10 (material like fiberglass but stronger) components running on an air powered slide that is exposed to all kinds of vibration... I never even thought about using these washers for exhaust bolts but I can vouch for their locking ability as we have yet to have a bolt loosen and we are using 10-32 thread bolts.. These washers work very well. I also would replace the bolts with SS ones like you have recommended before....I replaced mine with SS but will have to get these washers too....
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