The problem I have had with the UNI is because it is not a pleated filter it has far less surface area than the stock filter or the K&N. Because of this I have to clean the thing ALOT. As soon as the surface gets covered with dust performance drops off rapidly. The pleated filters, besides having more than 3 times the surface area, will trap the dirt in the valleys first leaving the peaks cleaner to let more air flow past. I'll be getting a K&N this winter.
