like he said, its a vibrations damper matched to your stock rear end gear ratio. its completely useless after you change your rear gears, i took mine off. it weighs about 7lbs, not a big difference, but the little things add up, as we all know.
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1990lx coupe, 302, gt40p heads, wolv 1087 cam, 1.7rr's, 65mm tb, 75mm maf, comp box on top of cobra lower, anderson ford pms, full exhaust, drag type susp. and 3.55's. traps 105mph
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