Quote:
Originally Posted by CTMP4me
Not tying the cage to the rear shock towers seems like a missed opportunity to reinforce them and maybe run a rear coilover setup.
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The shock tower is not structural and should not be used as a mount point for the down bars unless it is reinforced and tied into the frame rail. Most I have seen fail to do this, including the second car you reference. Putting a cap on the shock tower does not make it a structural point on the chassis.
There's no benefit to running coilover rear shocks on a Z4MC. An adjustable articulating perch for the spring is all you need.