Matt, in my research the S14 and S15 have the same part numbers for the head assembly. I believe the power difference was entirely due to higher boost pressure and ECU tuning, which are open items anyways.
Matt, in my research the S14 and S15 have the same part numbers for the head assembly. I believe the power difference was entirely due to higher boost pressure and ECU tuning, which are open items anyways.
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