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1) just tie-wrap them up underneath your car. free, works for some.
2) buy two spark-plug anti-fouling adaptors. use these to offset the sensor from the exhaust flow. $10, works for some.
3) buy some o2 sensor foolers (fvd sells them). what, $100 or something, works for some.
4) ROW ecu flash - euro cars don't throw a code if no cats. free if you know someone with a piwis or pst2 tool, otherwise you gotta convince your shop to do it.
4) Custom ecu flash - sets ecu sensor thresholds such that the exhaust doesn't trigger a code. $600 to $1k.
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