I know it's kind of late now, what other mods do you have that made you want to pnp the header ?
Have you read about the +/- of doing that over on NASIOC ?
213,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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