The current EFI for 2Ts works very well. My father has an 07 and I have an 08 Polaris. They have 2 fuel injectors (per cyllinder) and oil injection (NOT mixed fuel). We have run them from 0 degrees to 60+ and from sea level to 9000 feet w/o any jetting hitches (although they can run a little lean at low elevations when it is cold).
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