challenge: What engine was fitted in the Vemac RD408R, as opposed to the RD320R?
  
  A. Mugen Motorsports MF350S 3.5 L V8
  B. Mugen Motorsports MF408S 4.0 L V8
  C. Mugen Motorsports MF320S 3.2 L V8
  D. Mugen Motorsports MF458S V6
  Answer: 