The result of many months’ of development work, PRORAM air filters feature aTwin-Tangential Velocity Stack, designed to optimise air flow. This unique designhas been proved to flow more air with less turbulence, which in turn can offerperformance gains - especially with a tuned vehicle.The Velocity filter range has been designed to be as versatile as possible,this means all the filters can be used with any Velocity stack to achieve thecorrect neck diameter needed for your application!