Review on Boost Power with K&N Cold Air Intake Kit for 1999-2004 FORD Mustang: Increase Horsepower & Stay Legal (57-2532) by Eric Mueller

Installation was easy (except step 1) but takes some time. Although it was definitely worth it. Bought mainly for gas mileage. First tank I had was 19 mpg city of 16. Drops to around 1-2 mpg after a few months. Although, maybe it's my driving habits. When you start the car, it makes a cool sound like a high-performance car. This pairs very well with the dual exhaust system due to the increase in airflow and therefore power and gas consumption. The filters are easy to change (although they are very large, get a K&N cleaning kit) and look cool in the engine. Don't expect much performance from it, it's not a supercharger. I saw very modest throttle gains, if any. Get it for gas mileage due to gas prices! (But be careful with the pedal, it also uses a lot more gas)