Has anyone done the trombone exhaust on an 8A. The Vetterman website says not sure at this time for 8A.
Use mouse milk on all the slip joints before installation, and whenever you have the cowlings off.
FWIW, I have the Trombone on a M1S with a Superior Cold Sump.
Fits perfectly. Follow the instructions, easy to install and no issues.
RISERIC
I have the same engine and exhaust and I would like to see how you installed the hanger brackets for the exhaust.
Keep the muff joints loose ish. I over tightened and over 100 hours or so the weldment into the muff broke and left it hanging. Keep it moveable and lubricated
Let's be honest, that stuff is great for loosening joints, but at exhaust temps - it burns off in a few hours of operation.
For this application, nickel based anti-seize works well and will last longer, or use Loctite 299175 which also has a corrosion inhibitor good for 2400ºF.