bmcfarland
I am fortunate to own an 87 RUF BTR that is VIN 002. I have a letter from Alois Ruf stating that the car I own was the car sent to the US in 87 to get DOT approval to become a US manufacturer.
Also if my memory serves me correctly it was sometime in 86 that Porsche got emissions approval with the 930 to resume sending the Porsche Turbo to the US. There was a period of time, 84-86 I believe, where the 930 was not allowed. Porsche produced the M491 during this period while the 930 was not exported to the US. I was also told that the Yellow Bird is VIN 001 but cannot confirm.
I bought the car from RUF Auto Centre in Dallas TX. They were the RUF Distributor at the time and represented the car on consignment. This was in 2011.
Also a note on the article about the RUF BTR that won the fastest production car contest by Road and Track. Somewhere I read where Alois Ruf stated they used the slantnose to get that extra few miles and hour.
Hope this helps put things together.