Gen 5 Camaro External Bolt-On Tech - Strange sound

After my H/C install I am noticing a strange whistling noice that sounds like its at the rear of the car.

It is very faint and it doesnt always happen. It almost sounds like a tiny little turbocharger spooling up or something.

What is this? Fuel pump? Im not sure.

Did you tweak the rear end maybe with the extra power.

Did you tweak the rear end maybe with the extra power.

I heard it right when I left with the car after install. So if the rear was tweaked it was tweaked by them.

Some guys on c5 have said it could be the belt.

I did change belts and tensioner. It is not a big deal. I can barely hear it and its only at 2-3k rpm...just want to make sure it is nothing serious if you know what I mean.

im sure you know the difference but maybe humming from your differential?

im sure you know the difference but maybe humming from your differential?

Nah man...it does have a little bit of that since I went to poly mounts...but this sound is something new.

thanks for your input though.

exhaust or vacuum leak?

Still not sure yet.

I am going to look into it tomorrow. I have to work tonight so today is not a good day.

I will figure this out soon enough.

Come on 50