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Originally Posted by NY_Guy
... I recall a dyno graph comparison of Thunder air kit with Caddman with stock, and the Thunder generated 7 additional hp over Caddman (I think John Lawrence posted-- Gadget). Funny how a smaller filter (7") can generate more power? Maybe it has something to do with air velocity?
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7 HP? Not at all.
Here's the chart.
http://www.kawasakimotorcycle.org/fo...g?d=1157383074
The graph showed the Caddmann with
stock pipes, compared to a Thunder with
Vance & Hines pipes. There's almost no difference with equal setups, but with the Thunder it has perhaps a 1 hp advantage based on comments by Top Dawg, after testing his VN1600 with both setups. (He had a Pro-pipe rather than baggers though.)
I do not know anyone that has done an exact test of both setups, but the difference probably isn't enough to really notice.
My gas mileage went down slightly on the highway and about 10% in town, but recovered when I installed a taller reat tire. With more power you pull that tire with ease & the engine turns slower.