Brian,
I confirmed with the header co that the 2 1/2" would more likely have more scavenging effect to it than the 3" would. Because its a smaller step up in size. So you may not have as much response at lower RPMs with the 3". I am going with the 2 1/2" myself not only for the added ground clearance but for the better response. & since I wont have both a 3" & 2 1/2" at the same time for the Dyno test, I wont be able to test that idea for a while.
Ron
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