*righty tighty, lefty loosey * or some crap... lol.
i'd assume common sense with all damper adj'able coilovers, clockwise = tighten damper settings and anti-clockwise = softer damper settings. that's how my hks are.

ANYWAY, the OP asked Shunk2 or D2... i'm sure they didn't want to hear how being a daily he should get spring/shock combo instead or just springs for a drop, etc etc... coilovers > spring/shocks for 1 simple reason - adjustability.

ANYWAY ANYWAY... I would definitely go Skunk2... have had personal experience with D2 (in EK), and they were simply bad, and i mean terribly bad. and for the number of "bad reviews" you hit when searching D2, i'm sure you can see it's not just a few cases here and there... and as the other guys mentioned, the americans swear by their Skunk2 stuff, so i reckon you can't go wrong if they're your 2 choices. do it.