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I also can't find any difference in construction between the 2 engines, but curious that there are 2 separate tunes. Did find a reference to the 20i running 11.1:1 compression and the 28i running 10.1:1 compression, then I found another source that they both run 10.1:1 compression, and that the management software is different. Not sure what to believe, but as the 28i hits the streets, I am sure more details will surface.
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