Obviously, there's the .2 liter displacement difference. That means the Carerra engine is physically larger (bore size anyway). As a general rule it's easier to generate more power from a larger engine.
I think an interesting question would be what parts do the 2 engines share? Probably not many. I don't have extensive knowledge of the engines, but I would venture a guess that the main thing they do share is configuration (flat 6).
Though not as extreme, it's kinda like comparing a I4 in a Civic (1.8L 140hp) to I4 in an S2000 (2.2L 237hp). Anyone disagree?
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