Les is right. I have the DIYs on both Xfires cause the inner treads on the backs were wearing abnormally. Neither car is lowered and both are running 275/35-19s on the rears. DIY cambers corrected both cars nicely. I don't race/autocross either car. Just "spirited" driving so no problems. Like I've stated before, you'll get the same results from the $80 DIY setups as you will from the $240 brand names if all you're doing is simply correcting the inner tread wear anomaly. DIYs have been tested on both my cars for over 1-1/2 yrs with absolutely no problems.