Sorry, haven't really been on in a while. I use everything from a 13 to a 15. Currently I have a 15 on there. The last scramble I did was the first one w/ the build, and I used a 14, just due to it being tight and technical. I used the 13 a few weeks ago when I was climbing some mountains up Northern NY and VT. But I have been happy w/ the 15T, it doesn't really lug or anything. Imagine a stock, or maybe big 3, w/ a 13.5 if you could imagine that, thats what the 15 feels to me now. Not quite as crisp as a 13, but not luggish like a 14, a mix in between (comparing for a stockish set up as most people have tried those). I hope that makes sense, but of course I have a lot more than the big 3.
2008 700xx; Power Bomb header with power core 4 exhaust, Power Programmer III, pro armor nerfs, prm products control front and rear bumpers and full skid, 10" ITP rears, ITP Baja's fronts, RZR 2's all the way around, Uni filter, 13t sprocket, CCP steering Damper, DS450 shock swap, Dual Gasser Throttle, bar risers and Moose barkBusters. 730XX kit plus other engine mods!