Hi folks,

After installing a ROUSH supercharger kit on my automatic 2005 GT Mustang I have a harmonic noise at about 620 RPM when in drive. The noise is not there when the car is cold....but it starts to appear as the car warms up. When the transmission is shifted to neutral the noise disapears, and with the transmission in drive it disapears if the RPM's are slightly increased. No noise while driving until I come back down to stop and idle with car in drive.

This noise was not there prior to installing the Supercharger. I know it is not the super charger as this unit was replaced under warranty and the noise is still there. Comments or suggestions would be appreciated!

Thanks
Doug