Ok, thanks for the input. I forgot to mention I already have the street IRP poly motor mounts and I added the Banzai trans cross-member over the winter. And I just did the SuperPro steering rack mounts the other week. Those made a big difference in my opinion. Totally worth the money and hour or so to install.

 

Well, I only have a few miles on my Mazdacomp bushings but as far as I can tell, there's no difference in NVH from my OEM. Haven't had a chance to drive the car in anger. I considered poly bushings but happy with these. Install, just like OEM, which was also a plus for me. Yeah, they're oil filled, but then the OEM ones lasted 26 years and 130k. If these give me half that I'll be pushing 80 and won't be able to hear anything anyway.

edit: Looks like a nice weekend coming up and that should give me a chance for a little more evaluation. I’ll update when I can.

 

FWIW...I had a chance to put a few more miles on the car this weekend with the Mazdacomp diff bushings. A mix of freeway, on-ramps, and city stop and go. On a open remote stretch of 4 lane I did an improvised slalom at about 35-40 between my two lanes pushing it until tires squealed. Nothing dramatic, but it feels more stable in the back. For lack of a better term...'less squishy' than before. But my stock bushings were old and one had totally failed last summer, so it maybe just from that baseline comparison I'm feeling.
I have NOLTEC engine mounts and the MAZDACOMP differential bushings as the only drivetrain modifications aft of the engine. Ground control coilovers and the chassis has ~130k on it now. Even driving with the windows up and trying to be hyper-sensitive...no NVH since adding the MC bushings.