Useful Information [Automotive Calculators]

While at work yesterday one of my friends showed me a website page that might be useful to some of y'all out there. It's www.wallaceracing.com. Once there, go to "Automotive Calculators", if you scroll down it's on the left hand side of the page. Unfortunately I don't know that much about the actual mechanics of a car, but I know there's plenty of you guys on this site that do. There must be over 50 calculators on that page ranging from stuff like Compression Ratio, Piston Speed, and Horsepower-Torque Calculators to stuff like Header Tube Length, RPM Drop from Shift, and multiple 1/8 mile and 1/4 mile calculators. Everyone on this site always seems to have such great information, I figured this is my chance to contribute a little!