Definitely get the RS4 H-sports. They're well worth the upgrade especially if you've got the OEM S4 rear (B7's starting getting the RS4 rears). Tire Rack and Pure Motorsports have them for reasonable prices. Installation was a cinch for my mechanic - the only tools I am proficient with are: WD40 and duct tape
I've posted this before but here's some info on the differences between the different bars:
RS4 H-sports
35mmF and 29mm rear
Front 60% stiffer/ Rear +235%, and +305% stiffer than OEM
90% stiffer than S4 H-sport rear
S4 H-Sports
35mm front and 24mm rear
Front 60% stiffer/ Rear +145% & 215% stiffer than pre-2007 OEM (2007+ come with RS4 rear)
30% stiffer than A4 H-sport rear
A4 H-sports
35 mm front and 22 mm rear
Front: +60% stiffer/ Rear: +120% & +150% stiffer than OEM
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