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For the cats to run at their intended efficiency, they need extra oxygen to burn off the fuel. If Im not mistaken the older cars came with one-way cats, which required the use of aux air to help them run. The newer 3 way cats usually dont need this additional air, but it wouldnt hurt performance to have them both hooked up, and not knowing which cats you have doesnt help. Im not familiar with Canadian emissions, but do they allow you a pretest?
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