I have a 951 with a similar noise. It was hard to isolate without a stethoscope. With the scope, we pinpointed it to a sticking lifter on no 4 exhaust. It makes a light ticking noise. I ran some top end oil through it and it seems to be dissapating. There also seems to be a heat shield rattle, very faint, but there at about 1-3k rpm. You can get a mechanics stethoscope at any auto parts store for about $10. I highly recommend it for occasions like this.
Dave951M
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