I think these are a much better option.
Solid Subframe Bushings for Nissan 370Z & Infiniti G37 | SPL Parts
They are not annoying to drive with and have no plastic or rubber to go bad.

Your not going to notice much of a difference with either unless your tracking your Z. Where there is some noticeable difference.

Also I think it's a bit disingenuous to start their video comparing a rotted out OEM bushing compared to theirs which is brand new.

Maybe a better overall outcome but not a <2 hr. do it on the floor job like the collars. TBH I don't need the SPL's for spirited street driving neither.

Had the Z1 Aluminum Sub Frame Bushings installed
https://www.z1motorsports.com/transm...r-p-12015.html

Noticed a difference right away. No more shimmy or squirmy feeling in rear of car in turns. The car is now solid with no shimmy when applying the power to the ground after a corner. Its a major improvement in the handling and power transfer. Highly recommended with rear solid urethane diff bushings.

Good product from Z1 Motorsports