I have finally replaced the cap and rotor.
No difference in the high rpms.
Since i have changed and inspected every electrical component in the ignition system i have to rule it out.

Is it possible that the guides/seals can begin to vibrate or something on high rpms ?

What happens if a/the fuel injector(s) wears/clogges up.

If i have a clogged up cat and it is the leaking that i can hear - where is the leak ?

The sound is coming more from the driver side of the engine.

Well , i have to fix this problem because my wife is complaining about it.

Pelle