Hey guys, decided to start designing my own manifold, wondering what runner I want the W/G flang on? Also what size piping would make for the best flow? 1 and 1/2in or 2in? Any help would be great thanks.

 

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ideally, you want the WG to take equally from all runners. In the real world this can sometimes be a problem, so the more runners you can take advantage of, the better. The size of the tubing depends on the motor, and flange size. 1.5" is fine for hondas.