Complete one of the following levels with an 'A' rank during the Capelli missions to unlock the corresponding vehicle in Time Trial mode.

Hampton Avenger: Rat Race level
Hampton Monte Cristo: Rat Race level
JME Marlin: Cold Contract level
JME Otter IV: Witness Protection level
KMT Seareaver: Cold Contract level
Zephyr ATS Law Enforcer: Don The Run level