I supposedly have a 383 Lingenfelter Corvette. It says LINGENFELTER on the throttle body. I have a piece of paper and Lingenfelter's catalog that came with the car. It has a Borla exhaust. I tried to contact Lingenfelter to get paperwork on the conversion, but they didn't seem to want to help. They said they didn't keep any records of their conversions which seems like a bunch of bull. How do I find out where my car came from and when it was modified? It may have originally been sold in Canada. Very frustrating when you can't find out anything about your car. Perhaps someone in this vast Corvette community can help me find out about this 1990 Corvette convertible