need help please

[jose_hdz646 10+ year member]

i wanna make an aero port. the port that comes out of the box, but i want it to be square i know that circle is more effecient n what not but this is what i want n i want it just for competing i wnna have it tuned pretty high when i compete does anyone know how to go about comeing up with the length for it? and is there a specific name for it? reason i wanna do this is because when i have my sub set up for daily i wanna have a square port going in and for competing aero coming out. please help

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