I was talking to a fellow Saturday from a local shop here in Nashville, Taylor Diesel, about my pump. They'll put it on the stand and test and tune it for @ $150. 00. If they have to get into the pump to replace parts the price jumps to @ $1100. 00. He said this is because of the price of the seal kit for the pump. As far as turning a non-215 pump into a 215 pump, I don't know. It would at least require replacing parts that are probably very expensive. If I'm not mistaken, I've seen stock 215 pumps for sale from different vendors in the neighborhood of $800-$1000.
Scott