just got an ex with a slip on and power kit, it has fast trekkers on the back and a +1 sproket on the front. My friend has a stock ex with razrs. his razrs are about 1" taller than my fast tekkers. On top speed he still pulls past me. Is there anything I can do to fix this?

 

bigger tires. up bigger front sprocket down the rear sprocket to give ti a high ratio... try getting some 22-24in tires and keep the gearing hte same or go down 4teeth or so in the rear sproket and go up 1 more if you can in the front