Car making weird noise?? Maybe the heat exchangers?

[StuttgartNut]

Well this might be a stupid question but at the autox yesterday i was going to go get a burger beforeit was my turn to go crazy.. I got on the gas hard down the street and found a new noise ive never before... It was coming from he rear passengers side.. it didnt do it but from like 4-5500 rpm and only under full throttle. A 911 guy there went on a run with me and he said it wasnt anything internal as it ony made anoise a certain rpm. We got under the car and where the 3 tubes go into the big box on the heat echanger it seems to have those welds but lookmore like a tight squeeze fit instead of welds.. But i could kinda push on it and see that were they met that it had a lil movement. i could see how they were just barely moving back and forth.. It is an sc with stock exhaust.. Maybe this is aproblem and can i use like a jb weldor someproduct like that to fill in that and maybe take the noise away??If this is the problem anyway..

The driver side one had no play in it and the sound was coming from the lose side... so maybe this a cheap fix ??

[Leland Pate]

Possible. But mine is the exact same way.
You are really describing the same sound and conditions that I had when I found a snapped headstud last year.
Might be worth removing the valve covers and taking a peek.

[Leland Pate]

I would never had known that I had a snapped head stud if it hadn't been for that hill climb I was running. I could only hear the noise at around 4,500 to 5000RPM... Not something I do often.

If there is only one stud that is broken, I don't think it is audible until you get real hard on the throttle.
I hope this is not the case but if I were you I'd have a look real quick.

[not_sure]

Describe the noise, mine started making a chatter sound under full throttle also lately. Im not sure where to look as it only does it while driving.

[Leland Pate]

If I were to sit at a red light and rev my engine up to 5K I would not hear the head flapping. It was only under hard acceleration that it was really audible. And it almost does sond like a low exhaust leak.

The easist thing you can do is pull the valve covers and check.
There is no real way to convey the exact sound it produced.
Keepin' my fingers crossed...