1960 Plymouth XNR Prototype - w/ a Well Tuned 170ci Slant 6 Under the Hood, That Reached 147 MPH ********** US Regulations (?) demanded this ONE OF ONE work of art be destroyed. Exner had it shipped to the Middle East, where it bounced from Shah, to King, to Emperor and such, until it came home in 2012, and sold at auction for $935,000.