As long as your car passes and Ontario Drive Clean test and a MTO safety inspection, you really don't have to worry about anything except making noise. You could have 34562362 RWHP and it wouldn't matter. There is however the chance that a cop just wants to be a dick and really can hassle you about whatever the hell he wants.
Have you ever heard of Bill 241??
You should check out these links.
http://www.fsra.org/ontario_241.html
http://www.petitiononline.com/sect1722/petition.html
http://www.naaaccc.ca/sema_jan_2003.htm
This is really a threat to any car enthusiast anywhere. If this passes, it might set a precedent for every other province/state to do the same thing if they really want to.