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Actually I may have misled some as I thought Mr Yuck meant 39 hp going from 1-3/4 headers to 2" headers not from manifolds. And he may well be right as it just seemed like alot for the header upgrade. Sorry if I misled anyone. Ron

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Perhaps not; rereading the posts, maybe you were right and they meant 39hp between 1 3/4" and 2" headers. All I know is that is way more that I would think is possible on a stockish/street style 400 -450hp build. On a 500-600hp motor, maybe.

Dave