bought these shock absorbers to replace my old factory pair which finally broke after a long life of 200,000 miles on my xA! As worn out as my old shocks were, it was like night and day putting those bad boys on. they double the stability but, on the contrary, tighten the rear a bit, which isn't too bad for the passengers. Don't be fooled by negative reviews, they won't break your back or make your car unbearable, they just tighten the rear a bit which can actually be quite comfortable on tight