Gsket between cylinderhead and exhaustpipe

Had the typical exhaust puffs when leaving the throttle.
One reason can be extra air coing into the welding 4 tubes to teh silencer.
Another can be leaking air at the cylinderhead,
Third to lean mixture due to CO adjust and TPC settings.
Colour grey as they should on the sparks, and TPC set right, so excluded the third possibility.
No cracks in the welding, checked.
Leaving the gasket at the cylinderhead, they where to say not in the best condition so I replaced them.
Taking them out can be a bit tricky but is possible with a bent and sharpend thicker wire.
Hope this did the trick. Will let you know.