Do I need any special tools or hardware to install this?

No special tools needed. Pop your air box open with a Phillips screwdriver, slide out the old filter, and drop this one in. Takes about five minutes. Hardware is already part of your stock air box setup.

Will this filter fit if I have an aftermarket cold air intake?

This is designed for the factory air box. If you've swapped to an aftermarket intake system, check your intake's filter specifications—most aftermarket kits use different filter sizes and mounting styles.

How often should I replace this filter?

Depends on your driving environment. City driving with dust means every 15,000 miles or so. Highway and clean air? You can stretch to 20,000. Pop it open and look—if it's caked with dirt, it's time.