OK This is based on Audi TTs rather than Mk3s but I
think it works like this:
Standard shocks are Bilstein B4s
B6s are dampers with a greater damping rate and therefore act to stiffen the suspension (quite significantly).
They are also quite expensive!
B8s are competition spec and designed to work with shorter travel, i.e. with shorter springs and a B8 based setup would be very very stiff and work well with, say, Eibach sportlines.
Polybushing works to increase the stiffness too - powerflex bushings are notoriously unyielding, but improve the degree of control the movement of the suspension arms perform.
So, ALL suspension modifications will, in theory, reduce ride comfort. They will certainly reduce suspension travel, so ride will be "stiffer", however a worn out suspension might be less comfortable than a modified one because of the uncontrolled, crashy ride such a suspension will exhibit.
So there.
(edited to sound less like yorkshire dialect.
)
