You can easily get some free horsepower out of the Team Associated RC10GT2 RTR.
1) Remove the carb restrictor. This will increase top speed by 2 MPH. You’ll have to richen a little bit your carb settings. Your GT2 will be more prone to fishtail because more power will be delivery to the rear wheels.
2) To increase top end, you can reduce the gap between the header and the tuned pipe. Make sure the tuned pipe doesn’t hit the header, this may cause radio interference. The opposite is also true. to increase bottom end (torque) increase the gap between the header and the tuned pipe.