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I remember reading an article about the nissan spec-V when that first came out because everybody was surprised that they decided on a 2.5L engine for the car up from the 2L in the old SE-R. They said that the extra .5 of displacement helps with power but they could also lower the compression a bit to help with emissions issues.
the 2L may be a similar thing were they dropped compression a bit...or it may be for just that last bit more power and remapping the computer that helps with economy with out making it slower.
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