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Well, I saw zero difference between a Performer and a stock 4bbl intake on a mild 360. So if there is a dyno chart showing 20 hp gain with no other changes I'll call BS.

The SB Performer has 318 sized ports. Dulcich did a dyno test on a mild 360 and the stock intake made a few more hp. I've never seen a Performer 383 or 440 vs a stock intake test .