How To Install An Air Filter and Intake Performance Kit

K&N's air filters are designed to replace the factory air filter, while their intake systems replace the entire air box and air intake in your vehicle. Both increase airflow to the engine for improved performance. The reusable air filter can be cleaned periodically to maintain smooth airflow. They're street legal in all 50 states, and most intake system models are offered in four different colors, so you can pick one that's right for your vehicle's color scheme.

This install covers the procedure for a K&N Typhoon intake for the 1999-2003 Miata. K&N's detailed, step-by-step instructions make replacing this system easy. Most intake systems require only simple hand tools and less than an hour to install. The factory-replacement air filters are even easier, as many simply drop in to the factory air box, which is usually a five-minute job.

For this vehicle, air originally entered the engine through a small rectangular opening at the end of the factory air intake, crowded up against the inner fender. Now, the engine gulps in air from the large K&N air filter that has a 360° intake. Now the engine gets more air with every stroke and the improved performance is noticeable. And the installation was quick and easy.

Removing the factory intake hose from the throttle body.

Removing the air intake from the factory air box.

On this vehicle, the mass airflow sensor is removed from the factory air box; this part is reinstalled with the K&N Typhoon intake.

Clamping the Typhoon intake on to the throttle body.

With the factory air box gone, the new air filter has plenty of room to breathe.

A side view of the Typhoon intake installed — you can see the mass airflow sensor reinstalled next to the air filter.