I just installed a set of CPP Upper Control Arms (still have grease on my hands), had it alligned, and wow what a difference! I will be adding the rest of their control arm upgrades to my S4. For my next suspension upgrade I was thinking about a set of anti-roll bars. After seeing the sorry state of the anti-roll bar bushings on my car today, I was thinking about either buying a front and rear set or getting new bushings and adding the CPP bar links. Anyone have any experience with after market bars or the CPP links?? Thanks.