I checked into kms myself...the downside..it runs around $1400 last time I heard,..
Two 35mm fcr carbs will run not as good, but almost as good! They run around $800-$950 depending where you purchase..
Upside,..the Kms does integrate a wideband o2 to monitor a/f ratio, and adjust it accordingly, unlike the 700r which doesn't. Widebands can compensate and do some of the job that the mass flow/air density meter does on autos.
Never heard on the reliablity of the sytem and don't really know anyone who has'em..except the turbocharged kms raptors.
You know, everyone keeps saying that if you want to dump a bunch of cash just get a 700. Well, here's the way I look at it. The KMS kit isn't that bad considering what you get is a full efi kit with a programmer, and it had the a/f gauge as well. For the $1400, that wouldn't cover the cost of even the sales tax and a few basic add ons for the 700... so in my opinion, I would rather keep my rappy with the steel frame that I can easily repair myself, with the thousands of dollars of mods I've already done, instead of paying a dealership even more money and sales tax, and losing all kinds of money selling my raptor that there really isn't even a market for any more now that all these used 700s are comming onto the used market.