The hottest air intake for F150's delivers cold air! Our Velocity Tube kit uses a high flow 3.5" mandrel bent tube from the throttle body to the stock airbox along with a 3" tube from the airbox into the inner fender. This means cold air is drawn from the inner fender for excellent hp gains. Remember every 11 degrees rise in temperature will cost 1 hp - keep you airfilter in the box! Ceramic coated to reduce internal engine bay temperature, bright silver finish. Sold without the KandN - the stock replacement can be used.