I have been through a few different set ups on my truck, first was stock, then a K&N stock replacement filter, then a PDR "cold air" intake, then a AFE filter on the PDR pipe cause the PDR filter was crap and almost took out my turbo. The biggest benefit I can see with the current setup is space savings and a washable filter, if your stock I wouldn't worry to much about it. But if you want something simple I did see a little gain by cutting holes in the factory air box with a hole saw, the stock inlet is a little small compared to the size of the filter in it