If I remember right, Doug was having problems with his old throttle bodies which is probably what this is. I don't know if his revised TBs have come out yet. This one may be OK but it might be one of the bad ones.
I think it was mainly idle problems and one guy reported a couple miles per gallon fuel economy drop. I don't know if this one on Ebay is OK or bad. I think most of the TBs were OK but there were several threads where guys had problems and Doug stopped making them for a while. BilletFlow is a great company so I don't want anyone to think I'm knocking them. I'm going to be buying idlers and a pulley from them in a week or two.