Help Turbo Making Weird Noise Coming On Boost Then Goes Away

[DuFFR32]

HELP!!! NEED ADVICE

OK the car was off the road for 3 months while i got it engineered and got it registered its been on the road now for 2 weeks and all these little annoying things have been happening! Grrrr haha

All im worryed about is the turbo has gone through some weird noises since its been back on the road like whining and a kinda weird horn noise its so hard to explain it happens coming onto boost as the turbo is spooling up like a faint siren noise but as soon as it builds boost it goes away and makes a normal spool noise, ive done a search and it could be leaking manifold as the very back exhaust manifold stud is broken but its been broken for awhile and this noise happened yesterday.

the car hasnt lost any power and pulls hard still but i did notice a hot oil kinda smell after putting my foot down 2nd to 3rd boost read 1 bar still. no noticeable loss of oil in the engine bay either or blowing any smoke out exhaust

Could be needing a catch can maybe?

I will have a look at the compressor side of the turbo and see if there is any shaft play or fin damage sometime this week

If the turbo is shot would it be worth an upgrade or a rebuild?

also is it possible to get an rpm meter for the turbo? it would be interesting!!! mm watching the rpm spool would be nice

heres what the car has modifyed,

R32 GTST SERIES 2

HKS2530 turbo

HYBRID FRONT MOUNT 600 BY 300

R32 GTR INJECTORS WITH RESISTOR PACK

Z32 AFM

TURBOSMART DUEL PORT BLOWOFF VALVE HALF PLUMB BACK HALF VENT TO ATMO

RUNNING 1 BAR BOOST

TURBOSMART DUEL STAGE BOOST CONTROLLER

3 INCH EXHAUST TURBO BACK

[boostn0199]

that siren noise is air leak somewhere check all the cooler piping all the times ive had it its come from there just give it some throttle and put your hand on all the cooler connections and see if you feel air