Shopping for a Mustang Cold Air Intake and a Mustang Performance Tune should be easy – you want to purchase the best performing intake system that delivers maximum horsepower, offers great reliability, all with the highest level of quality available for your hard earned dollar. To the novice, the Cold Air Intake from “J” is superficially similar in appearance – being comprised of an airbox, filter media, and an inlet tube. However, that is where the similarities end. When you look real close at the design of the airbox housing, note that there is an inherent design flaw that does not completely seal the airbox from the engine compartment – a flaw that will certainly allow unwanted hot engine compartment heat to enter the airbox. When you cutaway the various components, note the connection between the air filter and the intake tube….this slip on connection has the inlet tube sticking out directly into the path of the incoming air – forming a pronounced step that is essentially a built-in turbulence generator. This will precipitate an increase in turbulence of the flow of the incoming air. This turbulence occurs at one of the most critical areas of the CAI – just upstream of the Mass Air Flow sensor….not a good thing for maximizing efficiency or performance. A design element we have incorporated into this CAI is our exclusive aluminum velocity stack component that we developed directly from feedback and tests from our factory sponsored Mustang racing program. This velocity stack serves multiple purposes – primarily to ensure a smooth airflow across the Mass Air sensor so that its readings are not compromised, and also to provide a denser flow of fresh incoming air. Read on: http://www.steeda.com/blog/2012/03/mustang-cold-air-intake-truth/ .