depends on what track your on, if you widen the car it will handle better at high speeds and open tracks but it will suffer on tight tracks, it will increase your turning circle which I consider a bad thing for tight tracks. I'm only a small time racer so Its pretty friendly where I am, but I would think there would also be limitations on the dimensions of your car so that it meets the class your in, it may be "illegal" to run it wider than a determined limit.