I had the same problem with the ball joints on my new exhaust from Acorn, had to send both back for re-work. I eliminated the springs and I am using titanium bolts and 12 point nuts was the only way that I could get them to seal to my satisfaction.
It does hold 75% power to 18k.
Dan
67S P337-0168
Last edited by Dan schultz : 07-19-23 at 10:00 PM.
Reason: Power
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