I finally pulled the valve cover to determine what has been making a strange tapping noise. The extra lift on my new Typ4 cam has my rocker arms hitting the CDR baffle. I guess I'll have to switch to and RDT so that I can run a valve cover without the baffle. Until then I'm going to glue two double-stacked gaskets together with Permatez Aviation Cement and hope for no leaks. Next on the list, I'm going to try cleaning out these relatively new injectors to get rid of the noise that they make. Hopefully I don't have to buy a new set. These have less than 10,000 miles on them.