inefficent. The pressure drop is very large, and the cooling properties are very low. Take for example HKS's IC's who have two individual ics acting like a front mount. They have the tubes going upward, with the tanks on top/back. With an IC designed like HKS's there are more tubes, with less length, so less pressure drop, and more cooling properties. Its probably an upgrade from stock, but i'd like to see if it cools any better then some stillen or hks side mounts.