Stillen 402841 Hi-Flow Intake Kit 07-09 Nissan Altima 3.5L
The first step in upgrading your car's performance is to replace the restrictive stock air box with a STILLEN Hi-Flow Intake.
Additional air flow increases the engine's efficiency and power output by increasing the quantity of the air/fuel ratio. The STILLEN Hi-Flow consists of a K&N cone filter that incorporates a velocity stack which uses the venturi effect to accelerate air intake speed.
Power and throttle response will improve throughout the entire RPM range. Your best dollar-per-horsepower investment by far! Most people find the authoritative note of the intake pleasing, but note that increased noise levels will result.