Originally Posted by 95civicdima
My unexpert opinion. You can't be positive i thought i'd throw something out there that no one considered. Also i've definetly hurd some similiar sounding on a 1999 sunfire and it was the muffler.
Maybe the muffler was faulty, and somethng else was causign the whistling. Only thing I can think of is for example on my car there are little rubber hangers that if worn out, can creak quite loud if the exhaust pipe wigles for some reason.
Speaking of which I gota replace those.
EDIT: I havent "hurd" a muffler sound like that before.
04 Mazdaspeed Miata #2373/4000: IHI, BBS, Harddog, Flyin'Miata.