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I have seen charts that based on the displacement (cubic inches or cubic mm) and the possible air flow in can show what size pipe you should have to avoid scavanging.
Bit I just don't remeber where!!!
What I took away from it was that 90% of factory systems are pretty close to correct but tend to error on being slightly undersized.
The other varialbe is the rpm range that your are going to operate at the majority of the time.
For me w/ a 4.5liter V8 that range is 1700 - 2200. with the 2200 being accelerating and the low being what is 60-65mph on the freeway.
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