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Old 03-05-2018, 07:15 AM   #7 (permalink)
Ecky
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ND Miata - '15 Mazda MX-5 Special Package
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I can't say for certain, but I imagine the '04 HX motor would bolt up to the '04 sedan's transmission, and have mounts in the same place. Part of why the HX gets great mileage is because it has a much taller transmission though.

The HX has a wideband O2 sensor, so you'll have to do a bit of custom wiring there. Most of the rest of the harness will probably be the same.
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