AVO Rear Diff Anti-tramp Bushing Install Pix
 

The AVO Rear Differential Anti-Tramp Insert Bushing will firm up the rear differential bushing in your Subaru. This reduces excess differential movement under power, eliminating wheel hop when taking off from a stop.
This also keeps power from being lost due to excess differential movement under power.
As this is an insert, it's extremely easy to install and doesn't require you to press out the old bushings to use.

Specifications:
Polyurethane bushing
Applied Models:

2013+ Subaru BRZ
2013+ Scion FR-S
2013+ Toyota GT86

I wouldn't say these bushing eliminate wheel hop, reduces maybe

Verbiage is straight from AVO's website. Not my words.

They do reduce wheel hop. At stock power levels they eliminate it. Notice the test car has a stock rear sway bar and stock exhaust (stock tires too)? It is Supercharged making 265-275whp on my Mustang dyno. We have noticed no wheel hop since the install and there is definitely less differential movement.