I just installed an AEM intake this afternoon. I took the truck for a drive and it actually seems a little slower compared to my modded stock air box. Plus the dryflow filter is huge, and fits pretty tight in there. I believe it's a 5" pipe that the filter clamps to. Does anyone have any ideas of a high flowing filter with good filtration? I would prefer to use an oil-less filter, but I'm open to suggestions. Thanks.