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We then installed the exhaust gaskets supplied by JBA and secured the headers using the new 8mm bolts. JBA uses sealing beads on all of their headers. They've found that, when installed correctly, the raised bead around each port increases the pressure exerted on the gasket directly adjacent to the port, stopping leaks. Working from the middle outward, we first snugged each bolt, then went back and tightened them further to 13 lb-ft.