Help with my EVO IV!!!

Hey Guys I am new to drifting and would like a little help hear. Do I need to do something to my rear diff to mke my car drift better?? I have the HPI drift tires and Novak brushless system but I still can't hold a good drift. If its just my skill then fine I can practice but I feel like the car is not set up properly. :banghead:

Thanks for your time.

What kind of car?