Join Date: Jul 2011
Location: Southern New Hampshire
Circling back, I have no idea why someone would want to emasculate a MazdaSpeed3 in such a way, but hey, for enough money, yes, you can probably figure out how to put a Fiesta ST motor in a Mazda3 body.
The above said, this is a really-REALLY bad idea.
2006 Acura TL 6-Speed Manual
2016 Mazda3 s GT 5-Door 6-Speed Manual