Would you like to be able to test your car modifications without needing a flow bench, dyno and wind tunnel? You can Welcome to a series of great, down-to-earth and practical testing techniques you can carry out on the road without having to spend a lot of money. Test the flow of airboxes, airfilters, cat converters and mufflers. Aerodynamically test your car and improve the flow through intercoolers and into airboxes. Analyse handling, turbo response, cam timing changes and engine management tuning changes. And not only can you test the results of your modifications, you can also make measurements that will show you which modifications are likely to be the most effective on your car. This is a book that should be on the shelf of every car modifier.