for a civic, Im sure there are tons of aftermarket parts, and places that supply them. if it was me, Id contact one of the more reputable shops and ask them if they could make a UPD that does exactly what your looking for. they will have far more detailed data on which does what.
the UDP for my ranger was the same size/diameter, just made so much lighter it worked perfectly for both increasing FE and torque.
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~Mike
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