True. The BC Motor Vehicle Act already has a few sections.
Clearance height
7.091 A motor vehicle with a gross vehicle weight rating of less than 4 500 kg must have a minimum clearance for all parts of it, other than the wheels in contact with the level roadway, that is no lower than the lowest point on the rim of any wheel in contact with the roadway.
[en. B.C. Reg. 167/2006, s. (a).]
Sidewalls don't get much thinner than 3". I would not want to drive a car around with less than 3" of ground clearance.
Wheel alignment
18 Side slip of the front wheels shall not exceed 9 m per 1.6 km as measured on the alignment gauge.
The caster, camber or toe-in of a vehicle shall not be out of adjustment to the extent that it is apparent visually.
Vehicles shall not be misaligned to the extent that the variation of the track exceeds 75 mm and the variation of axle centre exceeds 50 mm.
Motorcycles The swing arm bushing of a motorcycle shall not be worn beyond the manufacturer's specification which would affect the safe operation of the vehicle.
The longitudinal wheel alignment of a 2-wheel motorcycle shall be such that the rear wheel centreline must pass within 12.5 mm of the front wheel centreline when measured at a point directly below the front axle.
[en. B.C. Reg. 658/76, s. 2; am. B.C. Reg. 343/77.]
Is this subjective? My buddy ran 7 degree camber and a police officer noticed.
Vehicle noise
27 A motor vehicle shall be equipped with an exhaust muffler which complies with section 7.03 of the regulations.
The opinion of an inspector as to whether the engine and exhaust noise is greater than that made by other vehicles in good condition of comparable size, horsepower, piston displacement or compression ratio shall determine whether exhaust gases are expelled with excessive noise.
When tested in an inspection station, the vehicle engine, any auxiliary engine and exhaust level shall not exceed Table 3 standards.
Table 3
[am. B.C. Reg. 656/76, s. 2.]
Class of Vehicle Maximum Allowable
Sound Pressure Level
DBA
Light duty 83
Gasoline-driven heavy duty 88
Motorcycles 91
Diesel-driven heavy duty 93
Should let my friend who straight piped his Miata know.
Nothing about stretched tires though.
