Erm...
http://www.teamtekin.com/t8/index.html
You might also want to see the third post down by a Tekin Team driver. Where did you see them endorse 6s on a 2650?!?
http://forum.teamtekin.com/phpbb3/vi...hp?f=38&t=2555
Think you were looking at the speed controller specs matey. The speed controls are rated at 6s, both of them, but 6s is not recommended for either of these motors. Believe me if you go 6s, you will spend as much time waiting for it to cool as you will driving it.