I have been having a weird noise coming somewhere from the motor, I would try to put up a video but I'm not sure on how to from a phone. It doesn't happen everytime but when it does it happens between 2800 rpms to 4600 I tried to here it when just revving the motor but it doesn't make the sound. It's like a crackling noise is the only way i could put it. Any ideas would be much appreciated thanks.

EDIT: It's an 05 AT coupe.