Novak HV with 5mm shaft and 3a HV UBEC

[Gee]

What benifits would you get if you upgraded the HV4.5 or 6.5 motor with the 5mm shaft and added the 3a High Voltage UBEC?

There is added strength of the 5mm shaft. The description Max Operationg Temp 180c is that more then before? Does it allow the motor to be run hotter?

http://www.shopatron.com/moredetail/...0.8180.0.0.0.0
http://www.shopatron.com/moredetail/...31.27275.0.0.0
Current e-maxx recommended Final Gear Ratio
6 cell 24.5:1
7 cell 28.6:1
Both second gear

The UBEC is rated up to 26.4 volts. I understand using the BEC will insure your servo is operating at 6v and help with esc heat. What would be the benifit of running say a 5s on the HV. Wouldn't you need to gear it down even more then the current recommendation to run more voltage?

Are there any other benifits of these upgrades? Would running the UBEC help with my spontanious combustion problems?