well... it only really creates drag when its on, there might be a tiny bit when the ac is off, but when the compressor is off, its a free spinning pully. the "power gains" your going to get out of it is going to be whatever weight you pull out. not really worth it in my opinion.
on a side note, you actually get better gas milage with the a/c on and the windows up(at least in my car while going anywhere from 55+ in all the times ive tested it) . the drag created from having open windows works against you more thanthe A/C compressor.
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Black Vtec Prelude-h22a power'd
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