If you want a Focus ST buy the petrol model, which uses a turbocharged version of Mazda’s L series motor.
Not sure about this so did a web search. It says on several sites its a 2 litre EcoBoost engine and one refers to it as an EcoBoom with the comment that failure would mean a rebuild with the opportunity to fit a forged bottom end, more boost and more power. The 2.3 turbo used in the Mustang is from the same family and is used in the Focus RS. No mention is made of any link to the Mazda L Series engine.
I know for a fact that the Mazda L Series morphed into the excellent Ford Duratec as used in modified form by Caterham (developed by Cosworth). The 310 bhp supercharged version was pretty much bomb proof even on the track.
Only reason I did not fit one in the Caterham was simple, the equally excellent 2 litre Zetec was way cheaper to buy, needed fewer expensive specialist parts to fit and for road use was more than adequate.
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