Plenty of 9920s in stock at the moment, along with 12020 warriors.
Runtime would depend on how/where you run, along with gearing. 10 minutes should be pretty doable, though.
I like to try a 10 or 11 xl on about 24 cells or so. I think it would be awesome. As far as 16 cells go I would guess a little more run time than a 9xl slyvester. May get a bout 30 min on a set of batts. :D
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Monster Mike - I'm either blind or ignorant. Where in the store can I find the 7XL-9XL? Also, are these Lehner or Feigao? I'm guessing Feigao, but the names in the store don't quite line up with whats being tossed around in the forum. Also, will you carry the coversion package for changing a standard gorrila chassis to a g2r? Gorillamaxx.com has it listed for $180.