My explorer intake has a internalegr in the upper and lower. Which gasket set do I need so It will be blocked off? Some say felpro 1250 but I heard there is a felpro 1250s that is metal core and much better but I don't know which version I would need for my stock port size? It does have egr block off in included it seems. The other question I have about that is that it seems to have no gasket for between the upper and lower?! I am so confused please help!