Ok here's what's going on. When in 1st, 2nd, or 3rd, under heavy acceleration, i hear a squeal/screaching noise. it usually starts around 4.5 - 5k rpms. Now, I can accelerate slowly in those gears all the way to redline without hearing the noise, which would suggest that it's possibly being caused by the movement of the engine/exhaust/etc that happens when I go all out. I can go full throttle in 4th and 5th with no problems. I can also sit still with it in neutral and bounce off the launch ctrl with no noise. Here's the noise:

http://www.youtube.com/watch?v=pk2Og...layer_embedded

It was suggested on the other forum that it may be my driveshaft rubbing on my exhaust. I have put he car on jacks and looked at what I could and couldnt find any marks. it could just be that I havent done it enough to actually mark it up bad enough though. Anyways, any help appreciated!

* I also havent had any mods done in quite a while.

 

Compressor surge.

 

If that is the case, why would it just suddenly start happening?

also... the car runs fine. boost stays fine, afr's stay fine. In the video I just took my foot off the gas as soon as i heard it. It's not a pft pft pft pft pft sound, its constant. Also shouldnt it happen everytime i get high in the rpms? It only happens if i accelerate as fast as possible. If i slowly accelerate, I can get up to redline with no problems.