Umm...he could have gotten gears and got the speedo gear installed with them(a lot of people do), in which case his speedo shouldn't be off too much, if any...
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92 AOD GT, K&N, ram air, pulleys, 2 ch. flowmasters, 4:10's, shift kit, 1 5/8 mac longtubes and offroad hpipe 14.249 @ 97.34 mph before the headers and hpipe
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