Just installed a set of rear sub frame collars from Z1 Motorsports. You definitely feel better power delivery and stability when you accelerate and decelerate since the movement of the sub frame is minimized. I would definitely recommend this as one of those "must have" mods because they're pretty cheap, they're much easier to install compared to poly urethane or solid bushings and the positive feel you get from the car is impressive.

There aren't really any install videos, so here is the one I made trying to show details of what's involved. Pretty straight forward.

 

Thx for sharing this! Been looking at this from Z1 as well instead of running solid bushings. A fair review.

 

Ya I don't think it will be as stiff as solid mounts but for how much less work these are, they're worth trying out and will probably help the stock bushings last longer because they can't deflect. I think they're perfect for the street and will help absorb a little drive train shock still.

 

I'll piggyback and say I just installed these about two weeks ago. Great product and noticeable difference. I can't speak to increased NVH as I installed my solid diff bushings at the same time, but these are an inexpensive upgrade and well worth it!

 

I also installed these a few months back on my 4-door Z. Great product, noticeable difference in cornering and throttle response. Only change in NVH I noticed was, at least with the 6-speed, it was tougher to smoothly modulate the throttle in everyday driving, meaning it tends to 'kick' a little harder when you just wanted to roll back into the power. You get used to it pretty quickly but I definitely have to pay more attention when I have passengers, even if they can't tell the difference. Well worth it.