The AVO designed 20mm solid rear stabilizer bar is a big improvement over the standard USDM or JDM OEM tube construction rear stabilizer bar. Adjustable for roll resistance, it improves turn in, removes body roll in corners, and works very well with the standard 21mm front stabilizer bar. A must have! Will fit to a USDM Legacy GT or Outback XT with the provided rear 20mm polyurethane bushings.