Update...
I went out to AutoZone, bought some M8-1.25 strainless steel flange nuts and removed the chrome acorn nuts. I kept the two washers on the exhaust screws, and put on the flange nuts.
No more popping from the pipes!
I plan on getting the HD exhaust gaskets for assurance and probably take off one washer each to make sure the flange nuts hold tight.
Thank you!
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2004 Kawasaki Vulcan 1500 Classic (Carb)
V&H Classic II pipes (rejetted carb)
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