Designed by Subaru with the group N rallying in mind. These are essentially firmer version of the oem style mounts. This better helps prevent flexing and in turn increases sharpness and response. I highly recommend these to anyone that is planning on running higher then stock rates springs and still wants to run rubber mounts. 

*Note 02-03 Impreza owners wanting to run 04+ rear spring will need these as well as Scooby_921 spacers if running these with 02-03 rear struts.