There is not much difference between ES And EF, just the addition of the lower fairing, or "belly pan" on the EF. There are numerous differences between the faired models and the E, relating to the lack of fairing. Someone pointed out standard vs sport, and the E has taller bars, and no fairings whatsoever. Also, the front brake M/C, speedo bracket, headlight/mount/bracketry are different. Drivetrain and everything else is the same. The faired models are relatively rare in the states because they were only imported here for the first 2 years of the model, and the latter 2 to Canada and Europe, as Suzuki thought the market was glutted with faired sport bikes and/or sales weren't up to par.