Russ is right on the money, greatly affects the compression ratio on the EJ257 using the OEM gasket once mating surfaces are reduced, it's not designed to handle this kind of compression as its at OEM thickness.
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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...
Last edited by RJ999; 29-04-2015 at 10:34 AM.
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