I have them on my Gen3 and so far my experience has not been good. They felt fine when I lived in Vegas as we have smooth roads for the most part. Since moving to So Cal the roads have really shown that these shock/springs are not really that good at all. I went with the stock springs 500/700lb and any bump shoots the car all over the place or bottoms it out. I am going to tighten my adjustments on the shocks all the way in a few days, as I am currently at about 3/4 of the adjustability to see what that will do. I may as a last resort change out the springs to something a little more stiffer and see what that does. But I just hate spending anymore money on these probably knowing it won't help much. I paid around $1200 from Partsrack, so if I add in another $200 or so for springs from Partsrack, I will be up to $1400 plus installation twice basically. I am really disappointed in them. I don't even track my car, so god knows how they would dissappoint on the track! Partsrack should really not carry these I think, totally dissappointed so far.