i run a PC on my pro and didn't notice much of a difference between the 5.1 all year in the epic, record setting, dry pow year we had. UNTIL, one of my last rides in more setup snow and the difference was HUGE. i was with three other pro's, a 155, 163, and an assault with a CE on it. there were multiple hills with multiple climbs and the evidence was surprising. i hadn't planning on spending the money to swap out the tracks on the 13 but now i'm thinking it is definitely worth it. my point, i didn't notice giving anything up all year in the dry powder but the advantage in spring time, more setup snow was significant. plus as others have stated, the 5.1 on both sleds, sucked when it came to down hill braking. as in it was making them nervous where it wasn't even a consideration for me until the other two guys started talking/complaining about it 3/4 through the day. now, what is the cost going to be for the new 2.6 PC? and is it worth it over the 2.25 since i'd have to do a chaincase mod on my brand new chassis??
pv