The are also a little firm for stock springs. Awesome shocks but work better with stiffer springs. In theory, shocks don't change the height but the gas pressure does work like added spring force and more so in B6 than the lower pressure stock or B4s so you may add 1/4" or so once it settles. Car will lose any wallow and have lots more rebound damping than stock shocks but you will also lose ride quality which is more based on damping than spring rate. The ballistics are really better with firmer springs. Their damping rates are set to mate with stronger sport springs.
I swapped the suspension on my Alltrack but had I kept the stock springs, I'd have just bought B4s. I hated the rear shocks on the Alltrack. I didn't get B6s with my GTI springs because of what I've said here and needed to keep a better ride for family reasons. I went with Koni special actives which are working out. Firmer than B4s when you need it, ride better than B6s but not as crisp initially or generally for that matter. B6s work OK with GTI springs but prefer something even firmer.
That said, I truly believe that they're the best readily available damper on the market. My bro autocrosses and didn't get B6s until he got significantly firmer springs. Considering how you need to rebuild the struts and would have rear spring access to replace the shocks anyway, which keeps the labor cost near the same, I'd strongly recommend doing both at the same time if get B6s. At least GTI springs and you probably won't notice a meaningful ride height difference unless you look for it.
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