Thanks for the replies guys.
After some further research I came across this link:
Environmental Protection Act - O. Reg. 361/98
The section on catalytic converters does not mention that HFCs are illegal:
Quote:
Catalytic Converters
5. (1) No person shall use leaded gasoline as a fuel to operate a motor vehicle manufactured with a catalytic converter. O. Reg. 361/98, s. 5 (1).
(2) No person shall operate or cause or permit the operation of a motor vehicle with a catalytic converter if leaded gasoline has ever been used as a fuel in the motor vehicle until the catalytic converter has been repaired or replaced. O. Reg. 361/98, s. 5 (2).
(3) If a motor or motor vehicle is manufactured with a catalytic converter, no person shall alter or cause or permit the alteration of the motor or motor vehicle in a manner that permits exhaust emissions to bypass the catalytic converter. O. Reg. 86/99, s. 4.
(4) No person shall operate or cause or permit the operation of a motor or motor vehicle that was manufactured with a catalytic converter if the catalytic converter, or any replacement for the catalytic converter,
(a) is not capable of performing the function for which the catalytic converter was intended; or
(b) is disconnected, removed or otherwise altered so that it is not capable of performing the function for which the catalytic converter was intended. O. Reg. 86/99, s. 4.
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Looks like HFCs should be OK. But I agree that keeping the stock cats around is a good idea for emissions testing just in case.