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I have a 97 civic ex and i have a full exhaust. I have a new ceramic header and replaced the catalytic converter and then a new 2.5 piping catback. Before I bought the hi flow catalytic converter i did have a extension resonator. This does nothing. On my car an O2 sensor is hooked into your catalytic converter, but i had my mechanic drill in the o2 sensor for me. A few days later my check engine light came on, assuming that the resonator threw my ECU a code. An extension resonator won't do anything but make it louder. I suggest buying a hi flow catalytic converter. on ebay it's like 50 bucks for a magnaflow. That's what i have. Took the mechanic 20 min to put it on.
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