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SKU: M3-200
These micro-cats screw into the O2 sensor port of an exhaust and contain a small catalytic converter. This allows the O2 sensor to be plugged into the back of them and assist with preventing CEL (Check Engine Lights).
They are a simple screw-in installation designed for DIY install. With these in place it's enough for most cars to avoid a check engine light, however it cannot be guaranteed as some makes / models have higher sensitivity for catalityc converter.
Two versions are available: