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Message: <blockquote data-quote="alvin24" data-source="post: 3715537" data-attributes="member: 63">Here's a good advice:If it ain't broken... don't fix it.Nothing's wrong with your ECU why wanna suddenly change to one that's not meant for your engine? =p Your own ECU + a piggy back ECU will definitely perform better than a 4G93 can ever do for yours. =) If you want rev cut, install a re-chip onto your 4G91's ECU to remove the cut.Why do you think 4G91 4G92 4G93 all have different intake manifolds in terms of design, length and size?Because a 4G91's manifold is designed to work best with 4G91Because a 4G92's manifold is designed to work best with 4G92Because a 4G93's manifold is designed to work best with 4G93If the 4G93's intake manifold is "superior" to that of a 4G92 and 4G91, don't you think it would be cheaper for Mitsubishi to just design ONE intake manifold to fit ALL different engines?Bigger doesn't mean better (Just like your exhaust). You gotta find the best size and design for your intake manifold... and for your 4G91's intake manifold, the best design WOULD be the 4G91's intake manifold. =pSame goes for the head. Best head of choice would be to retain your 4G91.Port and Polish will lower your 4G91's compression slightly... if I were you, I'd leave it as it is. 4G91 to begin with does not have very high compression.</blockquote>

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