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Exhaust sizing and backpressure makes a big difference.
The better non-Harley motorcycle sites will have lots of info.
To put it briefly, "drag" shorty pipes on a bike give great top end but are beyond sluggish off the line. Ever notice how crappy a bike sounds with them around town?
There are several online exhaust calculators that will easily show you the changes. Bigger dia. pipes can actually hurt your power and economy due to slowed velocity of the exhaust gas. Then theres the whole pressure wave timing calculations to play with, trust me thats what computers are for!
For the street, stick with a good muffler, stock size exhaust, and non-drag headers and you will be fine.
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