All I know is there is no defueling with the tunes so I believe the OA is a waste of $$
BTW jmo but I saw no difference with the Banks Bighead except the lightness of my wallet...lol
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2000 F-250 SCLB 2wd 7.3 auto PHP stock-65t-80dd-120race-high idle-no start 4"tb exh, wicked wheel, 3 guages, AIS, coolant filt,
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