Ok... so many things in this thread. The Stillen front bar is 29% stiffer than stock. The rear is 3 way adjustable from 37-70% stiffer than stock.
The stock front sway bar in the 370z is pretty close to optimal for agressive street use, but the rear sway bar is just too soft for aggressive street driving or track use. The soft rear bar keeps the car understeering though and going to a stiffer rear bar will start getting you oversteer, which is bad for novice racers.
I have the Stillen bars with coil overs that are set up way stiffer than stock, but a little too soft for racing. I have the rear stillen on the stiffest setting and the mix is outstanding for agressive street driving. With readjustment of the shocks, it would be good for track days, but I would lose a couple of seconds per lap if it were a gutted track car because the Stillen's are still a little too soft for hard core racing..... except that a track car will be lighter and make the current design closer to ideal in a lighter car.
With -2.5 camber rear, -2.0 camber front with stock Re050A's and the rear Stillen bar at it's stiffest setting, the oversteer in low gear at full throttle is still liveable. Try full throttle in low gear in a Mustang, Camaro, Corvette or Viper and you'll be doing doughnuts. My last car was C6 Corvette with Z51 suspension and you could powerslide it through every corner (with -1.6 camber). I had traction control shut me down right after apex at 50 mph in 3rd gear on 305 width RE050A's. The rear end on the 370z really hooks up, partly due to it's -2.2 degree camber in the stock setting.
Anyways, the reason I posted at this particular time is that the Stillen bars are on sale in May for $285 and they work well for agressive street/occasional track use.
Cheers!
-Phim
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