At the shop we don't stock air filters but i was wondering what is the best air filters to use.. Is oem always the safe choice? I find oem always fits the best in the airbox.. I find pureone to filter great but sometimes too good and a little restrictive sometimes. (i saw this on my moms 2005 Mercury Grand Marquis the qsud seems to looks clean all the time with the pureone air filter but it seems to have noticeable less mid range power with the pure one. What does everyone think when it comes to air filters? oem? Synthetic? Purolater? fram? etc?