if you look into the ms3 motor, no more timign belt, dont know if all the 2.3 are that way, but i guess the turbo ones are chains now, they showed it ot me at hte dealer, and it was weird, how long had it been since a 4 banger had a timing chai on a dohc motor?
plus in article it said to fit the 2.3 tirbo motor in the mazda 3 they had to rework the engine bay and make it wider ot fir the motor, i think the firewall was pushed back for one so behind the dash area was reworked.
apparntly its not a direct swap fabrication work is involved,
a sedan woudl look good as a speed 3
but i think the sales were int he hatches and the built it for what sells.