Wai, why dont you get your facts right before you go posting things that arent true??

A K&N panel filter will NOT DAMAGE THE CAR.

A lot of people are running them with no problems. Where problems come in, is when they are over oiled. If you dont over oil the filter, no worries!!

K&N panel filters are great because you can clean and re-use them, you dont have to buy an OEM paper filter every scheduled air filter change. I dont know about power gains, but they would probably be minimal.