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Universal O2 spacers with real precious metal Catalytic Converters lengthen the distance between the O2 spacers.
Oxygen sensors can occasionally trigger a CEL on stock vehicles due to the new advances of technology and would require an O2 spacer to bring the vehicle back to equilibrium and allow the ECU to read exhaust gases within the proper threshold.
Note: There is no guarantee these will work but they do increase the chances of working as intended. For the 3.0T Audi Supercharged V6, we've had amazing results with these.