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    Can i swap out my stock 5 speed for a newer si 6 speed?

    I have a 2002 Honda civic ex coupe 5 speed manual and I want that extra gear to increase my highway mileage since it usually runs at about 3k to 4k rpm in 5th gear at 65-75 mph. Would a 2006 Honda civic si 6 speed fit properly with minimal modifications onto my 1.7l I4?
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