E46 M3 tapping/ticking sound at 2k rpm

Hi all! I have a very disconcerning sound from my 2004 M3 177k miles. Theres a tap/ticking sound around 2000 RPMS that increases as RPMs increase. I'm wondering if its valve clearance and will a valve adjustment fix this or is there something else? Theres no vanos or motor codes. It almost sounds like rod bearings but I dont believe it to be that. No noticeable power loss. Any other ideas? Video below