It is not 125kw/tonne in victoria. Taken direct from vicroads
OLD DEFENITION of probationary prohibited vehicle (prior to 1 July 2007)
A vehicle which has;
a power to mass ratio which exceeds 125 kW per tonne; or
an engine capacity which exceeds 3.5 litres per tonne of the unladen mass (tare) of the motor vehicle
New definition of probationary prohibited vehicle (from 1 July 2007)
A vehicle that;
has an engine with eight cylinders or more, or
has an engine that is turbocharged or supercharged (other than a diesel powered vehicles listed in Table 1 below). There are also some lower powered turbocharged or supercharged vehicles which have been exempted and can be operated by a probationary driver who has been given an exemption by VicRoads. Refer to lower performance turbocharged or supercharged vehicles and exemptions.
has an engine that has been modified to increase the vehicle's performance (other than a modification made by the manufacturer in the course of the manufacture of the vehicle , or
a nominated high performance six cylinder engine. Refer to Table 2 below.
http://www.vicroads.vic.gov.au/Home/...edvehicles.htm
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