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gyro is track dependant, although I do recommend it, because you can simply unplug it for different track surfaces, or tune it down with ICS.
Higher grip tires for most surfaces (Atomic, PN or Kyosho) ...the rear aluminum hub is a must for me; the plastic one strips its set screw hole after 4 or 5 cleanings of the rear end (which you need to do).
Other than that, the differential, bearings are a must. I use a peice of foam instead of a commerical damper; cost less then a penny; but the damper is also good. Don't like carbon fibre rear plate, too stiff and same with Aluminum front plate. Again, your mileage may differ, and it really depends on whether you run on high speed track or slow and technical.
Start with the differential and bearings, rear alloy hub and perhaps gyro ...the rest is personal preferance and tuning to your running surface.
I almost forgot; upgrading the transmitter is high on my list; I'm dveloping a disdain for the Perfex 2.4GHz; it has more than glitches than Tiger Woods has girlfriends.
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