Is some knocking normal with the K24? It's not too bad at idle and above 2500 rpms. Between 1500 and 2500 it's noticeable, always has been. Seems to be getting slightly louder as of late. Car has 86,000 miles. There is also some pre-detonation and a very very small oil seep. I'm wondering if this noise is associated with valve lash and if the oil seep may be the valve gasket. The knock is rythmic with the motor, gets faster as rpms rise. Anyone have any experience with this? Side note: will be getting a tune soon as I added a takeda sealed box cai and invidia q300 exhaust. Thanks for the help.