Professional Products’ AirFlo Air Cleaner Insert increases horsepower and fuel economy by drawing more air into the engine. Turbulence is reduced thanks to a smoother transition of air from the perimeter of the air cleaner down into the carburetor, therefore allowing more air and fuel into the engine, increasing horsepower output by 7-10 horses. Installation only takes 5-10 minutes and can be done in between track runs. Professional Products, (323) 779-2020, www.professional-products.com.