Strictly suspension, go with the Energy Suspension kit, especially if you're running stock (i.e. anti-sway bars) components.
The Mazdaspeed (old Mazda Comp) stuff is pricey, if you compare per unit.
(I do recommend the Mazdaspeed stuff when talking about engine / trans mounts, front-nose rear diff, and top-rear rear diff bushings - none of these are "suspension" components though.)
I do recommend the DTSS eliminator bushings, as they do make the rear end more stable and predictable.
If you're used to the original DTSS, this mod will cause the rear to "feel slow"; it takes some getting used to, but in the long run the chassis is more stable.
Mazda used to sell an OEM replacement, but I'm not sure if this is still available or if it's "NLA" listed now...
-Ted
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