Originally Posted by
MikeR
I have had 6mm phenolic spacers on the Aero for over 3 years..... they work fine but I found that the best sealant was the copper gasket sealer.... I still have to re-torque my plenum screws once or twice a year..... but that is not a uncommon thing...

No, it is not uncommon at all. That needs to be checked all the time. And, I don't run any spacers....