034Motorsport 034-402-1000 Solid Rear Sway Bar, B6/B7 Audi, Adjustable The 034Motorsport Adjustable Solid Rear Sway Bar substantially reduces understeer and body roll onB6/B7 Audi A4/S4/RS4 Quattro vehicleswithout compromising comfort on the street. In addition, the 034Motorsport B6/B7 Audi A4/S4/RS4Rear Sway Bar is engineered to be used effectively with the stock front sway bar. No upgrade in the front is needed or required. The addition of a stiffer front bar introduces even more push, requiring an even bigger bar in the back.