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Nice review!
Glad to see someone go from:
Stock RSFB's > Poly Inserts > Solid Bushings
And to make a nice detailed review. Just goes to show you that BMW started mounting the RSF directly, solidly bolted to the unibody, after the M3 GTS, for a good reason. Basically all the effects are positive and the negatives are few.
Basically the long install of the solid bushings would be the main downside for most. Considering it's very time consuming and all Labor Time.
Anyone who has an E9x and hates the rear end feel should at least do the inserts and if possible just do the Solid Bushings and have it done.
Im very interested in seeing, how you like the Delrin Rear Differential Bushings. And how the NVH is affected by going with the stiffer bushings, mainly the Diff.
The Diff. Bushings, rubber suspension mounts, and rubber drive shaft bushings will be what determines the NVH increase. I would suggest anyone going to do these things, to consider how far they plan on going. For example, if you decide you want the drivetrain to be Stiff. Then maybe some suspension bushings shouldn't also be solid..
Thanks
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