Would a highflow Magnaflow catalytic converter pass aircare in BC, Canada? Or would I need to buy the restrictive stock cat?

1990 Cadillac DeVille 4.5 passed aircare with stock cat and stock muffler

now have no cat and flowmaster exhaust wondering if magnaflow will pass or I will need stock cat.

thanks

Magnaflow may be able to give you some statistics on the effectiveness of its products.
The easiest way is to see if it is legal for sale and use in California, and has California Air Research Board (CARB) approval. If it does so, it should easily pass the BC test.
http://www.arb.ca.gov/homepage.htm