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I know this subject has been done to death on here already but just want to clarify which sensor needs to be spaced after doing this. Is it the on on the pre cat body or the one on the main cats?

Have done loads of ready on the actual gutting and the benefits but can't find the answer to this question anywhere so best to ask those in the know

I had mine done on my rs4 never moved anything mate and its been fine so far

the one after the cats