Well I sold my 2009 summit x with the 860 big bore and now im looking at coming over to the 4 stroke side of sledding. But im kind of new to the Yamaha's so any info would be great. I rode my friends 09 nytro, stock sled, but I want more. I like the impulse stand alone turbo kits but im torn, I see a ton of '08's for sale, whats the difference between them and the '09's ...thanks for any info.....