Had trouble installing my AEM Short Ram and complained to AEM and the retailer. AEM told me the unit the retailer had shipped me was obsolete and had been redesigned. Retailer took back the first one and shipped the (majorly) redesigned one which went on like a hot knife through butter and works beautifully. So props to AEM but a warning to Short Ram customers: there are obsolete units out there so if you encounter trouble, make sure you purchase the redesigned one. The new one has soft, pliable rubber on the cone filter--if you get one with hard rubber, send it back. The new one also anchors to the distributor instead of to the valve cover and the MAFS is extracted from the old housing, inserted into the AEM chrome tube, and screwed down.