A new lower doesnt make sense. It cant get any bigger vs porting unless you port the head too or you'll have a big lip. Obviously a machined piece will be more accurate vs hand porting or maybe give it a different shape or funnel? Maybe the runner length will get longer or shorter?? Will that add or move power around? If it does you could always take a oem lower and just machine the top or each side to shorten it. Hmmm what would a shorter lower do? What about machining a spacer making it longer?
We do need a uppet though!
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13 370z-
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