Cars are customize to give it a new unique look and to improve its performance. Most of the custom cars, other than being use as transportation or to showcase, it is often use as street racecar. Custom street car are for people who love the adrenalin surge, they want to impress others, express their self in a different way or might even use them for races. A street car racer can get a lot of money from winning in a street car race, but it might just covered for the expenses in customizing the vehicle to a street race car and for its maintenance. 

A simple and ordinary car can run very fast, all that is needed is to change its engine, using nitro boost. Replacing the ignition will help a lot plus some silencer to reduce engine noise. With that fast speed, never forget to have the great look for your custom streetcar; both will bring you the greatest car in the world. For that good-looking design, check out some car enthusiast as well. They can give you a lot of practical information and you can personally ask them. Other than that there are car magazines and also the web to get some ideas in customizing street cars.