 The Commodore BT1, or the Police Pack was a special pack for the VP Commodore that was available to the Australian and New Zealand Police Forces.It was based on the Commodore Executive and added various specification upgrades to cater to the needs of the Police Force.Many believe that BT1 Commodores had a "cop chip" which increased the engine power output, however this is a myth, as the engine power is the same as in regular VP Commodores.