I recall seeing another member or two post that it was in the high 900s-$1k fitted. That may have been dealer pricing.
Always cheaper if you can do it yourself of course. That goes for all the above pricing.
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Some of the early 2013 builds did not have the altered turbo drain fitted and therefore suffered from the smoke issue (gee its impressive on a cold morning!). According to the relevant LR Bulletin the last of the VINs suffering the issue was DA676456, anything after that will be fine.