B
Time will tell for me I have a 06 M7 that kicks a$$ on most 800s including the summit xp's . Now I own one we will see.
I had a 153 06 m7 with racin station 800 big bore kit, jaws twin pipes and clutched. It would kick the **** out of and wasn't even a comparison to a stock m7. ran better then any m8 back in 07 I put it up against.
xp stock would outclimb the m7/8 I used to have. put a slp pipe and head on it and on off/throttle responce was way better with a little better top end. Cant even compare the ride of the m7 with holz brackets to the xp. Only thing I would give the cat was it was easier to sidehill and control during a side hill in low snow conditions. in the deep snow I like the xp much better. I think the 16" wide track really helps. The m7/8 had power. wish I had tried a 156x2.5 on it to see what it I would do before I sold it. Might have ben a different story on climbing in deep powder then.