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Ekams right. One before one after. I strongly recommend a shop do the install. I have a 92 5sfe and it didn't bolt right up. You need an aftermarket cat converter. I was running straight header for two days because I had no cat.( I did the install myself). I have one 02 before the cat, one after. I have no check engine lights, but in california there is a manifold cat with one sensor before, one after, then a secondary cat. You can't duplicate that with an aftermarket system. Good luck, if you have any questions just ask. And yes I noticed a slight gain, but its slight.
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1992 Toyota Camry 4dr
5SFE->??? Just wait and see!
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