Fiesta 2009 1.4 high pitch noise and more

Hi guys, i have some problems with 170k km fiesta titanium 1.4 96ps

High pitch whistle under acceleratio n in about 2.5 and 4+ rpm... only under when i press gas pedal and engine is working hard... its loud and, also i can little hear it when rev engine in neutral but i cant figure where from its coming.. only thing i can see "wrong" is exaust flexible pipe making some "ssshhshss" noise when i moving it...this is not an gearbox issue beacuse i can hear it with cluth in... any ideas? I tryed vacum leak start test, checked exaust shields etc.. water pump and timing belt are new...

Another problem is rattle / chatter or something like that if i accelerate/press gas hard from 1 to 2 k rpm...(sounds exactly like lightwheel flywell chatter videos on youtube from 1 to 2k rpm under load only) but this car doesnt have lwfw... and i think this is gearbox issue because i can hear some noise from gearbox when start endgine with clutch depressed in neutral, gearbox is making some "grrr.." noise there is link i recorded, u can hear that strange Grrr noise when engin start and stop:

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