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jtbo said
Chart posted earlier in my opinion can be perfectly good guide as especially with gasoline burners you are not moving that much of exhaust or air when cruising speeds are used, if you think that on highway car is using 20hp, rpms are relatively low, you don't really need much of diameter, with no restrictions from silencers it would spit out gases really well and more efficiently which leads even less exhaust gases.
that was my point also. I just watched my scangaugeII at 60 mph, 1812rpm and 30hp.
Most of us are using very little of the MAX hp availible on our engines. To use a diameter size based on the max is just silly. You want to be down a size or two.
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