Need Help With Setup.
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I have a revo 2.5, Im looking to set up for Track use.
What are the most important upgrades?

I have some parts already.
ext chassis,center diff,rear brake kit,
rpm arms,mip axles,Spectrum dx3 radio,

I also have a new 3.3 w/o pullstart.or a sirio 23 W/pullstart.
I have traxxas ext rear a-arm also,Should i use these or the rpm arms?

What? Tires & wheels, Spings , Gearing , Etc.........
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2 Revo's
LST-2
Ultra lx comp................ (for sale)