I enabled it on my '04. I purchased a four-stalk unit off of eBay and took the OBC stalk to bolt on to mine. I had purchased the OBC cable from Pdwight (excellent work, BTW), and after connecting everything I used my Durametric to enable it. Having the fuel efficiency figures, range, and temperature sure is nice. Makes you wonder why Porsche (and the original owner) were so cheap to not get this originally.