Do you want a simple bolt on piece that will improve your throttle response, and give your 00-04 Neon another 7-8 horsepower? If so, read further! This throttle body makes more power, and improves acceleration because of the larger throttle plate and throttle bore that allows more air to pass than the factory throttle body. The size of the factory throttle body is 52mm, whereas the MPx throttle body has a 60mm bore. Believe it or not, the 8mm difference along with a straight through bore (versus the factory tapered bore) makes a nice throttle response difference!