Spoon Sports Drop In Performance Panel Air FilterThe air taken in when the throttle is fully open is enormous and super fast. On the other hand, when the throttle is off, inertia works and the intake air is compressed before the closed throttle. The next time you open the accelerator, the compressed recoil sealed cleaner box will have more negative pressure, resulting in higher filling efficiency. As you can see, Honda NA's intake system is very sophisticated and important. The best air cleaner is