You can't really go wrong with H&R or Bilstein PSS9 Coilovers.
Both manufacturers have been around many years and have a solid reputation for building quality products.
To answer your questions:
Originally Posted by
S4Berry
Range of adjustablility - how much you can lower, both front & REAR (I want to go low)
Bilstein PSS9s will lower your car 10-30mm (0.4 - 1.2 inches) all around. I just confirmed this with Bilstein.
H&Rs will lower your car from 1-2.1 inches in front and 1-2.0 inches out back.
Between these two, if you really want to slam your car, H&R would be the way to go.
To echo ieatfishburitos, the rear coilovers on a B6 S4 are going to be hard to adjust no matter the company. You will basically have to remove the coilover, make your adjustments and reinstall it.
Stainless steel bodies or not
H&R and Bilstein do not use stainless steel in their B6 S4 coilover applications. They choose not too because of its relatively low strength.
Ride quality is very subjective. What is harsh to one person may be fine to another. I'd recommend getting a ride in a local car with the setup your considering purchasing.
H&R is lower priced, but doesn't allow you to adjust dampening.
PSS9s are more expensive, but you can adjust the dampening.
In the end, its all about what your intending to do with the car. Since you want to lower your car as much as possible, the H&R coilovers would be the better choice for you.
Both coilovers are currently part of our 2008 Holiday Sale. We're offering 10% off our normal retail price on all H&R and Bilstein products until the end of the sale.
If your interested in one of these systems, check out our B6 S4 Suspension Section:
http://www.awe-tuning.com/pages/shar...PPT=Suspension
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