I have a pretty old Traxxas Stampede (Model 3606) and I wanted to know if you guys have any suggestions for upgrades. Best Buy sells A LOT of stuff so ordering from there would be preferable. I will get stuff likenew wheels, maybe tires, stuff like that. But engine wise, what do you suggest? I currently have a Titan 12T 550. I was thinking of buying a new Stampede VXL all together but I don't know if that would be a good idea or not..