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honostly i dont think either or would make a difference... a little bit in HP maybe.... took me a few hours to make mine (mine were manuel not electric) like someone else said just need to be able to have the right tools to install... it is not hard at all to install just pull the exhaust cut the hole weld in cutout reattach to car then run the wiring to the switch
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1966 F100
352 V8
white/blue |