After I cut off the flange for the 3 Bolt I measured and the whole is 2 1/8 . The hole for the V band that you weld on to your header is 2 5/8 not sure how much of a difference this is going to make with flow probably not much at all being two different sizes like that .I probably should have gotten a step up in size and welded that first onto my header then to the V band. Yes I know it's not quite centered LOL but it's flat lol3 bolt GEE M racing. I figure going v band from 3 bolt is easier than 4 bolt.
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