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depending on year and application ive seen and measured 54, 56, 58mm. some 8blade some 7blade. hx40 is 60mm 6blade and a good mild upgrade thru htt. all come with 12cm2 exhaust housing. the 9cm2 is hy35 used on 24v autos
72' F100 Prostreet -- Quest for 15's
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