[squartus]

I have solid derlin rear diff mounts, have for a few years after I snapped my read diff bolt and the diff fell on top of my exhaust on the hwy.
Is a noticable whine, changes at RPM and can still be heard over a loud exhaust/blower/headers.
With window down it fades into the background pretty good, windows up and its obvious but not bad at speeds of 70mph +. Point is you will hear it, people will ask what it is etc.
If had to do over again id go with a polly type mount since its my Daily driver. Its a fairly high pitch whine, if was lower wouldn't be an issue.