You should check with the Spyder board. I do not remember what the addy is though. Reason being is the person who runs the board has just recently turbocharged a 4G64 99 Spyder. His name is Mike Gaddis and he lives in Atl (I think we all are turbo crazy in Atl ) The best part is he used parts from a stock 4G63 turbo and bolted them on. I do not the current running state of his car and what problems he has now run into. This just happened in December. That is where I would start.