9XL on 16 cells..what sort of performance?

[Rtsbasic]

Hi guys, I'm purchasing a new setup for my Emaxx - a 9920, with a 9XL, UBEC and RC-Monster heatsink. I'm purchasing it off a friend along with a few other bits off his Emaxx :)

My question is..what sort of performance can I expect from this setup on 16 cells? The previous owner ran 20 NIMH cells/6S lipo on it, he reckoned it was good for over 50mph with very long (30 min) runtimes. And what sort of gearing would you recommend? I'm switching to mod-1 gears with a strobe setup. Infact is there some sort of gearing chart of excel sheet to work out the final drive ratio for the emaxx when using the strobe?

Finally..as part of the deal I'm getting some new diff's for the front and rear (UE ones, not sure if they're the 6 or 8 spyder gear ones), some cvds for the corners (already have center cvds), and as previously mentioned a strobe slipper with some mod-1 pinions. Is there anything else I'm likely to break with this level of power? I'm hoping to get a pair of steel idlers off Mike before I run it on the full 16 cells.

Thanks.