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Exhaust geometry on bikes is tricky. While greater flow can be helpful, you also need to be mindful of the scavenging effect. Basically, exhaust pulses help to pull spent charge out of the cylinder, increasing performance. If you change the exhaust you can alter and harm the overall effect, thus decreasing performance. I'm not sure on the specifics, since I've never done any real mods on bikes.
The effect also exists for cars, but it tends to be less of a concern, since the numbers are bigger in general.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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