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What we couldn't manage to extract from our source is what kind of engine will find its way under the hood of the 2010 Mazda3 MPS / MazdaSpeed3. The most obvious choice is a turbocharged version of the 3's new 2.5-liter, 4-cylinder unit, but we wouldn't be surprised if Mazda takes advantage of its FoMoCo ties and uses a variant of the Focus ST / RS 2.5-liter turbocharged 5-cylinder engine that can deliver up to 300HP.