It’s a graphite gasket like the felpro’s.I wouldent even use those on low boost that disaster cost me a lot of money.The original graphite gaskets that came on the car my builder said where way better than todays graphite replacements.
The motor that went out on me was built in 2017 with the Felpro’s, when my builder spoke with the Felpro rep he said the older 9441’s where better made maybe you had those who knows.I had zero knock as well on the scan tool when it went.
Do not us Felpro 9441 they are complete garbage and even there reps say they should not be used at anything over 14 psi stock boost.Here is a Felpro 9441 that blew into the valley on an alcohol car at 25psi with no detonation they simple cannot hold cylinder pressure.