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i have one on my car (s14). Personally i don't really notice a different but my gasket did leak by where the coolant runs after driving it for awhile. all i had to do was re-torque the nuts and it was good to go. My head surface was pretty flat so i didn't need to prep it or anything. The re-usability is true, i've taken off my intake manifold a few times to re-clean it and it works fine.
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