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Reply to "Pat Mical headers"

I'm confused on the S collector. What is it actually? Don't see anything unusual or different in the pictures. Current style merge collectors have a different blending tube transition inside the housing from the old school all 4 welded together tapered into a 3 or 2.5 flange area. What am I missing here? Need some education clarity please.

The only thing I have dynoed that made a noticeable improvement were 180s which made 28 more horses on the test engine. Don't remember the % increase.

Please don't take this as confrontational, just research curiosity.
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