quote skyhook depending on what year your bike is...In my opinion, screamin' eagle throttle bodies don't work significantly better than stock, due to their restrictive manifold...this restriction becomes most apparent as you near the rev limit, so if you don't go there often, maybe the cheaper screamin' eagle is ok
if it's an '06 and later bike, don't forget larger injectors if you want big numbers on the chart...I believe some screamin' eagle throttle bodies include big injectors, which does make them somewhat of a value, even though they're not stellar performers
Last I checked, the SE / AC is the only option for those of us with the 08 / 09 with the "Electronic Throtlle Control" systems.
JW