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the jr sc adds (and i quote from jr themselves) "up to a 40% increase in power" thats no where near 300hp on a civic...120hpx40%increase=168hp...at the flywheel not the wheels
even if you get the boost upgrade kit thats only an additional 20% max = 190 and that is still flywheel
Both of these are using the maximum % increase, that means you more than likely will not get a 60% increase in total power
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