I just started adding in the tools to the main site with some better navigation (not much)... http://www.gtsparkplugs.com/CarbCFMCalc.html http://www.gtsparkplugs.com/GearCalc.html http://www.gtsparkplugs.com/TireCalculator.html Next Up - Fuel Injector size Calculator Compression Raito Calculator Other Suggestions??? Sandy