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This O2 cel fix actually has a miniature catalytic converter built into it (Europe 4) and will help eliminate that annoying check engine light you get after replacing your exhaust or removing your catalytic converter and sometimes even when you install a high flow catalytic converter.
Don't risk just using an extension because more often than not they don't work, this is a real mini Catalytic Converter built into it.
This O2 cel fix with a miniature catalytic converter will trick your ECU into thinking the stock catalytic converter is still plugged in. When you remove your catalytic converter, your post O2 sensor will see higher temperatures and more flow of unburned fuel.
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