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They have the filters that screw into the downpipes then the 02 sensors screw into the filter to trick the computer there is CATS , but it’s a gamble sometimes it don’t work,My friend did this on his S3 a cheap spacer/filter gave him readiness to pass inspection,I’m just gonna change my downpipes and get a real dyno tune to get rid of the cel light .
How much did you pick up the Meistershaft downpipes for? , I was looking at those too ?I was interested in AMS or Fabworx also
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