For reference I bought my 2008 Night Rod VRSCD last Aug for $5000. It only had 2 owners, 16,000 miles, it had been lowered and a 250 put on the back. The stock exhaust had been replaced with a 2-1 and the baffles removed. An extra seat, original parts and shop manuals, a new oil pan (don't ask), the original painted air louvers.
I've added a new windshield and LED headlight.
For the 2006 I would check to see what size gas tank it has. If it still has the small tank, IMO I would pass on it.
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