mamba max on emaxx with 2 6s lipo packs (( HELP))

[mwe-maxxowner]

I have an emaxx with the stock batteries powering the Mamba Monster. I just ordered from hobbyking.com two 6s 5000mah lipo packs. I am nervous about runningt the packs. I do not want to overheat anything or creat too many voltage spikes and ruin the motor. I know that if i run the packs in parallel I will double the voltage which could creat that voltage spike. Should I sun them in series or parallel.Or sould I just run one pack at a time. I do want it to be stupid fast but so fast I will over heat anything. Again i have already ordered the 6s 5000mah packs. What shoud I do????? Sould I be Worried????? Also Just like everyone else who upgraded from brushed to brushless I also recieved a significant improvement in power and run time, and I am sure I will see another increase when i go to lipos. BUT I DO NOT WANT TO RUIN MY MOTOR OR LIPO'S. Should i gear down A little to reduce heat or what????????? ((( HELP ME OUT)))