What emission tests? Does that answer the question?
Joking aside, some jurisdictions have noise level bylaws... so for example, in Montreal the idea of a delete would get you fined. Not sure about if the vehicle would be removed from the road till addressed or not. There are a few members here from the Toronto area that can speak to more of your issues.
As far as metric displays and things like DRLs, that's more of a thing if the vehicle is new from a dealer. Bringing your vehicle with you should not present any problems. But curious, doesn't your speedometer also show kilometers in small text? Been a while since I rented a car in the US and I can't remember if the dial showed both or not... but ours show kilometers in big numbers and miles in smaller numbers. To bring your vehicle may just require a basic safety inspection, but you need to begin researching the requirements for bringing it here permanently.