Just out of curiosity, is there any problem with running the GTB 4 cell, with the 3200 Orion pack? I swapped my 6 cell version for a 4 cell, and now I'm thinking I should have kept the 6 cell.

The whole "4 Cell" thing is for the most part marketing. The insides are no different from the original version. The profiles are tweaked, the heatsink is gone and it has 16 AWG wire. I haven't heard any of the lipo guys mentioning speedo thermaling issues, so I don't think the lack of heatsink will be an issue.

I guess my question was more along the lines of voltage? 4 cell being 4.8 and the lipo being 7.4. I know the 4 cell GTB doesn't have the lipo cutoff though.

I think as pmsimkins sates...the inside is no different than the Original GTB. If you are going to run 6 cell you should replace the 16 gauge wire with 12 or 14 gauge. Not sure if I would run it in a touring car or offroad without the heatsink and the lipo, but I have run mine in the pan car without the big heatsink and the temp of the ESC never exceeded 85 degrees. But to answer your question, from what I have been told it will handle the 6 cell voltage just fine.

Jack, Mike Bush has been running his ever since we started the 17.5/lipo class and has had no issues