This stuff gets complicated fast. Having a limit is fine but they need to have very clear instructions in how to go about it.
The Federal number for new cars is 80 (82-2)
https://laws-lois.justice.gc.ca/eng/...lText.html#s-5
(iii) SAE Standard J1470, Measurement of Noise Emitted by Accelerating Highway Vehicles (June 1998), the sound level does not exceed 80 dBA when a value of 2 dBA is subtracted from the final reported value referred to in section 6.3 of that Standard, in the case of a passenger car regardless of its GVWR or any other vehicle with a GVWR of 2 722 kg or less
This measure is obtained through a very complex and difficult measurement standard but translates to around 95bd in "real world" levels.
The city of Calgary ran up against this issue a few years ago and I doubt that Toronto will have much better luck sorting it out.
http://www.beyond.ca/calgarys-excess...ion/15447.html
Now... All that said keep in mind that the law says:
Muffler
(1) No person shall operate a motor vehicle or motor assisted bicycle unless it is equipped with a muffler that is,
(a) operating;
(b) in good working order; and
(c) sufficient to prevent excessive
or unusual sound and excessive or unusual smoke.
Same
(1.1) No person shall operate a motor vehicle or motor assisted bicycle equipped with a muffler cut-out, straight exhaust, gutted muffler, hollywood muffler, by-pass or similar device.
(1.2) No person
shall modify a muffler to increase the sound output of a motor vehicle or motor assisted bicycle.
Unless your exhaust is 100% stock they can nail you no matter what the noise levels are. Even just having pops or "unusual" noises is a violation.