losing manifold pressure at altitude

[Dan schultz]

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

[Ed A]

Rear engine performance has never been as good as the front no matter how many times the turbo, wastegate and controller were overhauled. Cessna gave up on the exhaust with all the clamps after s/n 225.
I’m thinking about buying a brand new rear exhaust of the new design, made with slip joints, hoping it will solve the manifold pressure problems.
Has anyone already tried this?