The AMS Performance Intercooler and its high efficiency tube and fin core utilizes 22 fins per inch. The AMS tube and fin core utilizes both internal and external formed/louvered fins which allow for smooth, unobstructed flow while maintaining a huge surface area with spectacular heat transfer capabilities. The results of our testing prove that our intercooler is the perfect balance of performance and efficiency. With its high degree of cooling the intake charge will remain cool even in the toughest of conditions. You will have piece of mind that your Golf R is running at its peak no matter if you are hot lapping at the track or driving spiritedly through your favorite winding back road.