I rode a 13 last Thursday for a couple hours. Noticed it wasn't hitting 8100 rpm even. Mostly 7800 to 7900. I didn't like the 155 in comparison to my 163 for the overall feel.
It did feel quicker. Most noticibly in the midrange. I drag raced up a hill with me on my 2011 163 and dealer/friend on 2013 155. I beat him up the hill and then we switched and I still beat him up the hill. I could tell the 155 was spinning more and the rpm was down when I had time to watch it. The only mod on my sled is TIED secondary and MTX weights along with springs. The TIED is coming off and going on the 2013 when it comes in so not worried about that.
It didn't feel much different if at all different in trying to carve. Granted, 4" of powder on pretty much solid ice makes it tough to carve any sled though. Running boards are plain out awesome. I have better boards on my 11 and these are as good or better in staying clear.
Not much else to talk about, oh, almost forgot, the belt is a little louder and you can really tell when going down a trail in the trees at about 30 mph. Not bad, just different.
