I have a '99 Air with the 290 carb. The boat we originally test drove was a sport(same boat) with a GT-40. When I ordered, I couldn't justify the 3K upgrade to the GT-40 at the time. I was a bit worried about the power thing until I actually got the boat. No worries for me in that area. Although I always love more power, I have yet to lack for power where it counts. Here are the key differences that I noticed: 1.) Overall Torque and pulling power seemed about the same. 2.) GT-40 was slightly more responsive to throttle adjustments 3.) GT-40 starts first time every time, whereas the carb might take a couple of attempts when cold...to be expected with a carb. 4.) GT-40 top end seemed to be about 3 mph faster. I spoke with the dealer at length about this before making the purchase, and was not disappointed. Having said that, I prefer to have EFI next time simply for ease of starting.
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