Well I think you've already got the best gearing and engine setup for a Metro seeing as how you have an XFi. Due to the power band of the car, you'd probably only want to drop it into another shell of a similar weight as the Metro. Not sure how you would be able to get it in a Miata since its a RWD car, and the Metro is setup as FWD. With the right trans you could do it, but I think like a VX its the trans that helps you get the FE the XFi gets its fame for
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