The diameter of the hose won't change the pressure, it is the restrictor that has the job of regulating how much volume goes to the filter. If the ID of the hose is determined by the size of the fittings on each end, then stay with that diameter, just try to duplicate the restrictor.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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