Replace the soft, stock rubber bushings in your 98-07 WRX/ Impreza with this Total Kit from Prothane. This kit contains the following bushings in red polyurethane to firm up your Subaru's suspension.

WRX/Impreza 20mm Front sway bar bushing kit (bar bushings only)
WRX/Impreza 17mm Rear Sway bar bushing kit (bar bushings only)
WRX/Impreza Shifter bushing kit
WRX/Impreza Front control arm kit
WRX/Impreza Rear Trailing Arm kit.

Check your sway bar sizes before ordering!

As your Subaru ages, the rubber suspension bushings deteriorate, wear, and soften up making your WRX or Impreza lose some of it's handling "edge". Freshen up your suspension to regain that "edge". It is usually a good idea to do this when you are upgrading your suspension.