Strange high pitch noise
 

This past weekend i installed berk test pipes and reassembled my stillen gen 3 CAI after i was done installing the test pipes.
Since the install i have noticed a high pitch noise that occurs with throttle and it occurs while in gear when the rpms fall. After the rpms have fallen for a little while the noise goes away. If i let the rpms slowly fall with the noise occurring, then clutch in, the noise will go away.

Hopefully you guys can help me in diagnosing this noise. Thanks in advance.

Search for "high pitched noise", there's several threads about it. Try to see if you can isolate the location. As you have a 2009, read up on the ECU whine in particular.

I have read up on the ecu high pitch noise, and i dont think thats what is causing the noise. The noise has just now began after installing my berk non-resonated test pipes and I readjusted my stillen gen 3 CAI. I am at 39K miles
Do the berk non-resonated test pipes make a high pitched noise on acceleration or when the rpms fall?
Does the stillen gen 3 CAI make a high pitch noise?

Does the sound come from under the car (near where the test pipes are)? Could you describe it more of a "hiss" than a "high pitched noise"?

I cant tell exactly where it is coming from. I will try to listen a little closer the next time i go for a drive. Maybe somewhat of a hiss, sounds more like squeaky brake pads than anything. It isnt really loud but i can definitely hear it if the my music is turned off.

Thanks for the comments, since you are the only one helping lol