3x9 K/N element on a velocity stack base. We ran the velocity stack base by itself with a thin tie bar on top and it by itself did NOT hurt hp at all. No xtreme flow top on the 3x9, did use one on the 14X3, it DID show a slight hp advantage (about 3-4) over flat lid on 14 x3, made no difference on a 14x4, Smitty
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