Look up the "RamChargers" for information. They had a setup like streets is decribing made out of radiator hoses on their first drag car. You'll have to do some calculations based on RPM and flow rates to calculate the length of tube to cut. You want a standing wave with either a node or anti-node (I'm not sure which) at the intake valve. 2500 feet per minute is the ideal flow rate. So, port it so you get 2500 feet per minute at whatever RPM you want to have peak efficiency at.