With the Tekin RS Pro and B44. You could put in either 5.5 or 6.5 too.
The RS Pro can handle the hotter brushless motors.
Something to think about.
Tekin has real good tech support from staff and team drivers. If you have questions on your Tekin, you can go to www.teamtekin.com
. They have thier own forum.
Everyone is be more then happy to help you with your questions.
If you have any.