Was hoping someone has dealt with this before, I've got a rattle/tapping that has been around for about 6 months now atleast, It seemed to only make the noise on decel around 2300-1700rpm. After playing around with launch control it makes the noise while holding rpm steady too.

Oil has been changed multiple times in the last 5000kms with nothing bad showing up.

EVAP valve has been removed to see if that was the issue, serpentine belt removed to check incase idlers causing the sound.

Have also removed valve covers to look for anything funky in the head however the cams and buckets all look brand new.

At a bit of a loss here with what it might be, unsure if it's possible there's a small crack on the headers making the sound echo however I can't see any soot around them

The car is a 2007 370GT Manual 6 speed it is heavily modified with a turbo kit.

Attached are some videos to hopefully help give an idea