Better progression x3 for MM 1.5
Increments stats progression for Drivers, Engineers and Mechanics by x3
Also Engineers can improve their skills with HQ buildings:
Wind Tunnel improves Front Wing and Rear Wing skills
Test Track – Engine skill
Telemetry Centre – Gearbox
Brakes Research Facility – Brakes
Ride Handling Development – Suspension
Staff Housing – All
Also Mechanics can improve Pitstop skill if there is a Test Track or Reliability and Performance if there is a Telemetry centre