had one since summer 2008, no problems. And i picked up a couple extra MPG on an average with my 4.6 over the dealer installed filter. I've seen road trips in the 24-25 mpg range. (i was being VERY mindful of throttle usage). If i had a 4.4's gear set, 30 mpg would almost be in my grasp.

no that wasn't an invitation to swap for anyone who's thinking that.. haha.