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Message: <blockquote data-quote="ALBundy" data-source="post: 151326" data-attributes="member: 15">Yup, the only worthwhile mod to do is go for the M50 conversion.There is only so much you can do with the M20, and money wise the returns from a M50 transplant is higher. To do the eta conversion, basically only the crank and conrod will be used. You will still need to use the existing 2.5 pistons (need to skim a little) for higher compression together with you existing 2.5 cylinder head. Then to optimise, the new compression and stroke length, a piggback ECU is needed. All in, the cost could be as high as a M50 transplant and yet the M50B25 engine will still outperform this conversion.</blockquote>