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If you go with aluminum subframe bushings and delrin diff bushings, there is no isolation of the diff. I need a civilized daily driver.
In my E36M3, I have poly subframe and poly diff bushings. Neither squeak and I think it is because those are really mounts more than suspension bushings and do not move much. I also have poly rear trailing arm bushings and those do squeak despite being well greased. I have had the poly RTABs in there for about 6 years and am pulling them right now to replace with heavy duty rubber bushings and limiting shims.
Also in the E36M3, I have run both delrin and poly front control arm bushings. No squeak from the poly. I first ran poly for a couple of years, then delrin for a couple of years, and no poly again. I pulled the delrin because they took away some of the suppleness from the front suspension and made it bang a bit more. I like a little compliance.
I will wait to read more about the experience of others with the E90M3, but my inclination would be to run poly diff bushings if I run aluminum subframe bushings, since my car is my primary driver and I want it to be civilized.
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