[AAIIIC]

Actually the fact that you don't need to remove the sleeve means you can do it without renting special tools.

And having the sleeve still in there means there's less bushing material. It's probably only a marginal difference, but it'll be a bit more firm than the bushings that remove the sleeve.

I'm wondering about the added diff whine with this bushing.

AFAIK, Energy Suspension uses poly with a durometer that's in the same ballpark as the other bushings that are out there, so it should have the same impact on NVH.

 

[AAIIIC]

Any time you replace a squishy rubber bushing with a firmer poly bushing, you're going to introduce more NVH. How much more noise, and whether it's objectionable or not, will vary from car to car and from person to person. And if your stock bushing is totally shot (as many folks have seen), you might gain a bit of gear noise being transmitted into the cabin, but lose some driveline lash/clunk noises, so the overall effect can be a positive.