With all this talk about dyno number I just had a revelation, Dynotech Jim dynoed the CFI-4 last year with the SLP setup at around 160, same with the PC-5, both used together didn't show a substantial increase. I had the SLP setup on my 09 Dragon 163 and it would pull 62.5 gram lightning weights with 1/4" drilled out at the tips, 140/340 drive with 160/260 team secondary. It would consistantly pulled 8200-8250. SLP recommends a 3 gram increase for the lightning weights over the stock Polaris 10 series weights.
Now, first ride on the Pro-Assault 55. Total 30+- miles, sled would hit 8150 and hold with 10-62 Polaris weights, stock Polaris 140/330 drive with 160/240 Team secondary. Ron mentioned that these have built in mapping for break in, that they would not perform at best until 100+ miles or a certain number of hours. Tank was pre-mixed with one quart oil on ride. The more time on this engine when it breaks in and loosens up it can only get better, right? That being said, out of the box with no aftermarket components it pulled hard and ran really well. I think we can expect very good things from this new CFI-2 and maybe this is a bad analgy, but pulling that weight at that rpm has to mean something! Slightly less track on ground but the Assault 2.125 track is also heavier equating to more rotational mass then the 2.4 163 track. These numbers were not on a trail either, this was in heavy powder with a load on the track.