The powder freaks t-stat was definitely one of the better upgrades I've done. Haven't overheated on the trail since putting it in. Mine will only go into warm up mode if we stop to build a fire for lunch. Didn't really notice a power difference on the long pulls.
Check out the spring spacers thread. I got them last year, really happy with them, reduces sag and was able to turn the spring adjuster knob back 2 spots.
Finally got out to the hills to test these spacers out. Immediately noticed a difference on the whoops on the trail, smoother and no bottoming it out. I was running the springs on "5" setting before the spacers and now I'm down to "3" might even try going down to "2" next time I go out. Very...
I got my stock one laying around, not sure how long it is but its off a 2014 summit. I got the Ski-Doo adjustable riser, I highly recommend it. I think it was $90