I have a 2002 FFR Cobra replica with a stock 1991 5.0L Mustang engine. One of the FFR supplied cats has broken and is not made anymore. The car is smog exempt so I plan on replacing the cats with j-pipes. These pipes do not have ports for smog pump air. If I don’t want to remove the pump can I either plug the hoses to the cats or leave them open to the atmosphere without adversely affecting the engine?
Thanks.
Thanks.