Pay close attention as to when it flickers. It COULD be a connection issue, although this is somewhat unlikely on an oem install.
-Does only one side flicker, or do both?
-If so, is it always the same side?
---In the above mentionned case, move the bulbs from left to right.
-If the same side still flickers, and intermittantly/randomly (not only when you go over bumps), its a ballast issue.
(shameless plug AbsoluteHID Replacement Ballast
If the flickering changes from one side to another when you swap the bulbs, its a bulb issue, D2S bulbs
If you have anymore questions, let me know.
I run a canadian led kit & hid kit company, if you have any questions about led headlights or hid kits in canada or would like to check out our products please contact me here: http://absolutehid.ca
2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 220M 19's, Michelin Supersports
2006 YZF-R6, bunch of go-fast stuff