See this site for more info on the Carrera 2.7 mfi cars:
Carrera 2.7 MFI: Successor to the 1973 Carrera 2.7 RS Touring (M472)
Basically an impact bumper RS. They are interesting and rare cars. They are valuable, but cost a small fraction of what a 73 RS costs (for now). We've got a 74 mfi awaiting full restoration.