Big tube header vs small tube header on a stroker

MHEAD said

I went from 10.80 with 1 3/4" 5204 hookers to 10.29 with 1 7/8" hedmans 75140

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Wow... 70 or 80 horse probably

my guess was it might cost me 15-20 horse using 1 5/8 compared to 1 7/8