If I read this right, for $599 I could upgrade the track to the 162/2.7 - cool ! While 1" shorter, this still mounts up to factory Polaris 163 rails ? And/Or Ice Age rails ? ...... Talking to Ice Age, the 162 fits fine. [The 1" change is just due to the 3" versus 2.86". (Sounds like a Polaris track is actually 162 when a 3.0" lug and pitch, anyway)].
Then I would need to update my drivers from 2.86 to 3". Looking at the Pol site - this is a whole new axle which retails at $620.
Can I still use the orig QD belt drive set up that came with the 155/2.6 ? - Yes (It's the same between 155 & 163). The difference between 2.6 and 2.7 isn't enough extra drag to be any different from a factory set up for 163/2.6.
So the 155 to 163 change - if using the x2.7 is looking like track at $600, Rails at $520, and an axle at $620 - $1740. Rails for $520 plus a Series 6 163 @ 1400 - $1920 - RETAIL prices.
Now to be on the look out for a crashed sled .... ?