Quote:
Originally Posted by bert powell
My SS 402 likes 1 7/8" step to 3.25 throat merge collector for what it is worth.
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As a header builder who has built several sets for these types of combinations, I think your sizing (1 7/8 with merged collector) is probably correct. 2" primary with 3 1/2 collector is likely too large. I am constantly trying to convince people that they want too large of tube sizes.