Eibach 25mm Rear Anti-Roll Bar Kit | 2005-2012 Porsche 911 Carrera (E40-72-007-04-01)2005 2012 Porsche 911 Carrera Rear Anti Roll Kit (Rear Sway Bar Only) by Eibach Complete your suspension upgrade with an Eibach Anti Roll Kit. While our Pro Kit and Sportline spring sets are regarded as the primary suspension enhancement components, the Eibach Anti Roll Kit allows critical fine tuning of your cars handling characteristics. Eibach Anti Roll Kit reduce body roll through increased design stiffness over stock bars. The result: increased