Are exhaust stacks legal in Canada? This question came up with a friend the other day and I have NO idea...

I know the big industrial trucks have 'em, but the only "production" pickup truck I can think of that has stacks is the Little Red Express Truck which was produced many years back...

Does anyone know if it is legal to retrofit an old truck with these, and if so what the requirements are other than that no section of the exhaust pipe can come through the cab and that it must vent behind the cab?

Thanks in advance for your input...

~Trev