I'm looking to replace my stabilizer bar bushings. I was looking at the Energy Polyurethane bushings and they sell them greasable and non-greasable. Whats the difference? Pros/Cons? Seems like greasable would be easier to install. Thanks.

Greasable is Polyurethane, non-greasable is graphite-impregnated polyurethane.

Go with the greasable ones... if they start to squeak, you simply grease them. the graphite ones will eventually squeak, and there's only one way to shut them up... replace them.