dude best bang for your buck is lithium upgrade by far
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www.undergroundxmods.com (cheap lithion and charger)
then if you like custom motors get carbon brushes neo magnets and bb can...once you upgrade your fets you than can try experimenting with the stage 2 armature by reducing the turns 10-25 less the most i have taken off is 25 turns(high revving but low torque)
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www.rcmart.com ,
www.minixracer.com ,
www.minizworkshop all have these items
oh if you get any of the above you definately need cup joints/shafts as they will break easy
dude personally i wouldn't mess around too much with 260 motors as 130 motors are good enough...plenty of torque!
although a team orion 180 is exceptional with accelleration but not with top speed...oh yeah and a pain in the but to take apart(to reduce turns you have to file down the tabs holding the endbell on)
Have fun