I just did these: PSR aluminum was very close to the same price as urethane replacements ($334USD shipped, after $140 int'l shipping), and I don't see any point to doing inserts. I tried Whiteline's inserts, and there's not a significant void to fill at the top/bottom of the mount, and they were designed for the VE mount anyway. Do not buy inserts.
You'll need to pull the lower shock bolt, the sway bar endlinks, and probably the rearmost muffler mount (this is the only one that's a pain to realign). You don't need to drop the LCA or remove the shock unless you're also doing a rear tire clearance check. The diff can stay attached to the subframe and move with it. You can use a jack and a socket or bit of pipe or something to push out the stock mounts: something close to the OD of the bushing would be nice so you don't replicate the one I did where the center tore out first, and I had to burn and cut the plastic shell out.
I tried to get by with a heat gun, and it was not hot enough. A torch solved this, and the plastic bushing housings melted a bit. I also had to grind down the outside of the PSR mounts a little: even freezing them and cleaning out the subframe points, they were slightly oversized for the subframe.
I have not noticed any NVH impact with the aluminum subframe bushings, or really thought about them at all when driving the car. This includes 4 track days and some commute driving
You'll need to pull the lower shock bolt, the sway bar endlinks, and probably the rearmost muffler mount (this is the only one that's a pain to realign). You don't need to drop the LCA or remove the shock unless you're also doing a rear tire clearance check. The diff can stay attached to the subframe and move with it. You can use a jack and a socket or bit of pipe or something to push out the stock mounts: something close to the OD of the bushing would be nice so you don't replicate the one I did where the center tore out first, and I had to burn and cut the plastic shell out.
I tried to get by with a heat gun, and it was not hot enough. A torch solved this, and the plastic bushing housings melted a bit. I also had to grind down the outside of the PSR mounts a little: even freezing them and cleaning out the subframe points, they were slightly oversized for the subframe.
I have not noticed any NVH impact with the aluminum subframe bushings, or really thought about them at all when driving the car. This includes 4 track days and some commute driving
