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Got the dreaded cat efficiency code after installing my headers

Turbeau

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Where are you located? I ordered mine through JB’s power center in Calgary. Made by Vibrant. They are usually listed as O2 sensor spacers.
 

stannypack

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Nagare

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^ these are what I used on mine when I went catless and shorties as well. Would have to clear the code once or twice a year but generally worked well.
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