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Engine Calculator This form is designed to help you figure out engine specs for all engine types - not just VW. Gear Ratio Calculator Configure and preview the ideal gear ratios for your application. (External Link) Tire Size Calculator Find the right size tires for your year and style of vehicle, and compare to other sizes. (External Link) Fuel Injection Worksheet This form is designed to help you select the proper Fuel Injector size for your vehicle. (External Link)