Always thought Z's had a solid rubber bushing and the goo was only on the Infiniti chassis.
NVH vs performance, respectively.
Have read some people simply fill the stock bushing with a two part silicone or some such epoxy.
Fine for a daily that never gets driven hard, I suppose
I opted to swap in a whiteline bushing and brace.
But I see there are stiffer braces out on the market now.
Also seen the use of a pathfinder diff, that has two bushings for support. But that necessitates adding a second hole/sleeve and bushing to the rear subframe.
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