I have a 19mm rear sway bar with bushings off that is the OEM Subaru STI model +08. I have had it installed on my 13wrx hatch for a few months. If you are looking for a decent upgrade in feel and tightening up the back end and keep your warranty intact, this is a wonderful option. It's noticeable as it feels like the back end follows the front into the turn a it more. Looking for $70 buyer pays shipping. Keep all inquiries to Pm please, I'm located in North Dakota.