I have a 93 WRX RA and after having my kit installed I sometimes hear a squeaking when starting out in first (almost like bad brakes on a large truck).

Also in 4th or 5th gear if you left off the throttle you hear kind of buzzing/vibrating sound that sounds rotational.

What could be wrong, is this an installation error by the mechanic or is it a defective part?

Any ideas would be appreciated.

Thanks guys