Hey, i was thinking on gettin a K&N air filter on my 05 636. But I'm hearin mixed things about them..... some say they are good but some say that they could really mess up my engine? Anybody have feed back on how i could avoid the damage to my engine? or dont you think it will do too much. Gettin ready to store my baby for the winter and drop a few G's into it to make it pull low 10's in the 1/4 and make it look nicer!