Well that kind of defeats he whole purpose of EFI. Now I know ATVs use "throttle bodies" which is the most primitive of EFI systems.
Kind of like when Chevy use them in the late 80s.

Unlike most new snowmobiles that use a much improved Direct Fuel Injection over a Throttle Body. Here a link the explains the difference. http://www.whyhighend.com/fuel-injection-types.html

"Direct Fuel Injection" is actually two generations above "Throttle body" being that "Port fuel injection" is also better then Throttle Body by not as good as Direct.