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[HELP]Exhaust Manifold (extractor) Gasket Problem!

hi guys, been having this problem recently. Weird rubbing/squelling-a-like noise from the engine bay (sounds like "jit jit jit jit" or "chit chit chit chit").
ONLY appear when engine is warmed up! sound is suspected to be coming from belt & pulley area.

✔ Already checked and changed all 3 v-belts (alternator, power steering & crank pulley belt).
✔ Checked all pulleys, no wobbling or loose pulley. No apparent misalignment...