Racing Dynamics is ready with their 515 HP S62 engine conversion. Note that this is a very conservative rating witht the factory air boxes on. RD has delivered 2 of these cars, one to Dubai, one to Belgium. Two of the same engine are prepared for Z8 customers in Germany now. Hence, ,your car will not be a BETA test mule. It's a ready to go product. Supposedly you are interested, the car will need to be sent to RD facility in Southern California. The estimated cost is under $20K (A high estimate). I will follow up with the cost if you are interested.