I have an exhaust rattle coming from my right header merge collector on cold starts.
It goes away as the car warms up but returns when race hard.
The knock retard I get on my scanner are little blips here and there no more than a degree or two for a millisecond. I also noticed on day when I was filming a launch that my exhaust rattles violently.
Can this be the reason for some unexplained loss of power? Checked everything mechanically and electrically to rule it out