I tried the Eibach front bar for a few events last year. I'm running 285 RE-11s all around. The Eibach bar on the stiffest setting made the rear very squirrelly...lots of oversteer. I went back to the stock bar and have been happier and faster. Really, it's driver preference, most of us here can't drive the car to its capable limits and Whiteline, Eibach, or other won't "turn" us into a pro.