We designed the valve covers to use the factory grommets. The grommets set the proper pre-load for the valve cover gasket.
A catch can with a breather on it is the best option for oil vapor right now. I haven't seen any baffled breathers that are aesthetically pleasing. Has anybody else?
Guy, do you know of a large enough catch can to run both sides into or should I get two of the small Mishimoto ones and do one on each side? Other then that I love them and they really look custom and dress up these engines nicely.