Originally Posted by Gex
Sounds like you broke one of the half moon plastic covers on the valve cover above the manifold. Apparently its a common DIY mistake. Try a search or I'm sure someone else can provide more details. I'm hoping I didn't do this myself with my uppipe install. So far it looks ok on mine. But I have not driven the car yet.
It is indeed very common to punch out a half moon seal when replacing the up pipe!
These are the gaskets your local dealership should have in stock..
While you have your valve cover off we recommend replacing the spark plug gaskets along with valve cover gasket
Valve cover gasket part numbers are 13272AA140 & 13270AA190(if you want to do both sides)
Don't forget Fujibond!