K&N 57i Performance Kits provide added performance for many European / Japanese vehicles at an economical price. 57i kits clamp-on directly to manufacturer's filter housing or directly to the engine. Most come with a flexible air intake tube which directs cool air towards the filter element. 57i Performance kits come with K&N's 10 year/million mile limited warranty. K&N intake systems replace your vehicle's restrictive factory air filter and air intake housing. K&N intakes are designed to dramatically reduce intake restriction as they smooth and straighten air flow. This allows your vehicle's engine to inhale a larger volume of air than the OEM air filter assembly. More air means more usable power and acceleration throughout the engine's RPM range. The filters on these kits are washable and reusable. Most of our intake kits are relatively easy to install using tools commonly available.