It's not a direct comparision. The RX-1 is a 145 Hp machine and the AC is a 110 Hp machine. For someone who has no experience with sleds I wouldn't be to worried about modifying either sled. If you are looking for a fast sled with lots of available mods get an F7 or a mach z or some other 2-stroke.
yeah, ive been wondering what kind of numbers the T660 puts up. i wanna ride one to feel what it can do.
i would go for a two stroke over the rx1. i think its funny when people say that the vector rules the 120 hp class, when its a 3 cyl. and a much bigger engine compared to everything else in that class. no wonder they'd have win, but look how much it took.
but i think the T660, from the vague articles ive read, which said it had plenty of power and was a good sled, may be an equal choice with the 2 strokes.
And when you put a turbo on the Yami, you can get 195 HP to over 400 HP out of the 4 cyl RS-1 and 185 to 200+ HP out of the 3 cyl Vector. 4.070 second ET at 126.9 mph in 500 feet (world record for snowmobiles) from a 4 stroke! sled sets the bar pretty high for the rest, I'm thinking.