B6 I hear is very good. I was contemplating between the cusco Zero 2R and the special version of the B6 called the WRC ARAI EDITION (Tuned by WRC Works driver Toshihiro Arai). I ended up getting the cusco because they are supposedly more for autoX and Circuits as opposed to the Zeals, which are more for the twisty roads (I heard this in Japan, so plz don't flame me). From what I hear they are superb. As to the recharging of the shock, I would have the manufacturer do it, just because I would feel safer that way. IfI'm pretty sure reputable suspension shops are able to do it, but...