only 91-94 BG proteges/Escorts/ 323 hatch are bolt in. Plus you need a complete Mx3 v6 subframe/transvers member/mounts/wiring/axels... pretty much a mx3 parts car.
So if you have a 95+ you might as well find either A. a new car for the swap or B. for the work it would involve boost or v8 considering you will have to custom fab everything.
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-2008.5 Mazdaspeed3 CWP