The best thing to do is to look up this information at your local DMV. I assume your province requires cars to be inspected (annually or otherwise). If so, I would start with that inspection check list - what is the acceptable passing level. Last thing you need is failed inspection because the law says you cannot have non-factory exhaust or something. If you can't find it at the DMV, chat up the guy who runs inspection stations. Even if you passed inspection, your LEO may give you a hard time from time to time. If they feel what they're seeing/hearing is annoying them, they may use the loud exhaust as probable cause to pull you over just to make sure car is inspected and you have no outstanding tickets or warrants, etc. Not saying that will happen to you, but it's happened to others.