I have a 3cu ft3 Box with a 5" X 16.5" Opening for a slot Port. How long should i make it for Hard Street Bumpin

I have a 3cu ft3 Box with a 5" X 16.5" Opening for a slot Port. How long should i make it for Hard Street Bumpin

here ill give you a link http://xsspl.tripod.com/Audio/VentCal1.htm
for hard street bumpin tune to around 30-35hz
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