Originally Posted by ChrisSlicks

It is stiffer than the Stillen though.

The Eibach is much thicker than I first thought, thanks for the numbers.

The spring rates for the Hotchkis rear are:

930, 1160, 1490 lbs/in (based on the 28.5mm bar)
+70, 110, 170% stiffer than stock 370Z

The Eibach rear sounds crazy stiff if their numbers are accurate.

Originally Posted by nismosis

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.