Jusr a wild guess but check the bracket that holds the muffler up on the right side just over the alternater. That bracket has been known to crack and can be causing the noise you hear. David Teitelbaum vin 10757 --- In dmcnews@xxxx, "d_rex_2002" <rich@xxxx> wrote: > Adam, > > When a metal vibration noise is heard at 2500-2800 rpm, you may want > to check the heatshield on the cross-over pipe. Although this is a > difficult area to inspect if the car is not up on a lift, you can > still get to it by jacking up the back end and using jack stands. >