Sorry, I should have clarified: Mk6 Rs and GTIs with a later Central Electrics revision (from MY13 from memory) had LEDs from factory (GTIs only in conjunction with bi-xenons); these latest builds could be coded if they'd not had LEDs factory-fitted. The rest of them all require adapters containing resistors. IIRC, TSIs and TDIs never got that particular revision of the CECM.
You definitely can code Mk6s (all models) for LED tails, from CECM 537 and up; build >= week 22, 2009.
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