all loctite products are great

i would use a loctiite silicone product

i have used the loctite copper silicone on the exhaust housing flanges of my turbos without any leakage. it is awesome stuff, better than any gasket

lagwagon also gave it a shot on his sr20det turbo manifold flange and he told me it lasted longer than any gasket he has had in there, not sure how long he had it in there in the end but knowing him he has changed the turbo 20 times by now

i also used the typical blue or red loctite silicon on my sump with no trouble