If you've ever been to an auto parts store, you've probably seen air filter boxes that claim extra power and more torque over the factory filter. But being so cheap and easy to install, it's hard to ...

Air filters are one of the easiest and quickest components to swap out for an aftermarket part, and plenty of companies claim their design will increase horsepower, torque, and improve acceleration.

Performance air filters are billed as a cheap and easy way to add horsepower to your car, but do they really work? Engineering Explained wanted to find out so they pitted standard OEM filters against ...