The rear coils are adjustable. but just like the coil set up for the VWs jetta and golf the adjuster is on the bottom of the spring the black purch is actually the adjuster. as for the ride find anyone who owns a vw with them on it and you will have the answer you are looking for!!!!! I have installed two sets in the last six months and both of them were awsome!!!!!!!!!!!!!the ride is amazing and the handling and control is really impresive.
(AND NO I DO NOT WORK FOR H&R) HAHA But they are really nice and simple to adjust and you will definitally not be wasting your money if you like the car you are working on!

goo luck!!!!!!!!!!!!