[sowise]

Ok, since my recent broken exhaust bolt fiasco I am noticing something annoying but can't find the source. Exhaust is all bolted up and seems tight no puffs of exhaust leaks around gasket areas etc. I did remove the cold air intake (injen) and reinstalled the original intake hardware (was too loud and no noticeable improvement) I have been seeing low power since original exhaust leak was noticed prior to broken bolt fiasco.

Ok, that should give some of the history, now since the exhaust installation I am hearing a whistle when I step on the throttle. Initially it had to be a hard throttle and happend at 4k rpm today on my way home it was pretty much when the throttle put a load on the engine and it was very low powered. I started the car and hit the throttle at the throttle body and can reproduce the sound but I can't tell where it is coming from. My worry is that air is being sucked in around the exhaust manifold, but not sure why it isn't leaking exhaust out. I have checked all my intake hoses and they are all on but can't seem to find the source of this damn whistle. I did loosen the bolts on the driver's side (where the sound seems to come from) exhaust manifold to the engine and retightend them. Tried several different sequences but not sure if any of them worked because in the driveway it only seems to happen at 4k since it cooled off. Could the manifold be warped and causing this?