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If you wanna go turbo then use the money you'd waste on a swap and build up the D16z6 or D16y8(the engine in the Ex civic) so it can handle 20psi+ daily.
As far as the differences between the Ex and Si, it depends on what year your talking about, like from 92-95 there wasnt any difference except the Si was a hatchback and the Ex wasnt. For the later civics, the engine is different and they should have different suspension/brakes(SI being better of course).
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