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As your fault is is the CAT itself If they delete the NOX function then the Cats in the map the car can't tell thats the cats are removed or not however as your NOX CATs are clogged then you are loosing performance regardless.
Direnza have a N53 NOX replacement mid section it relatively cheap and combined with the map is a fix, or its a cut and weld up job.
I haven't tried unplugging the NOX sensor with the map, i believe this would result in a fault code that would stop Stratified charge, however I havent tried it..
Getting rid of the NOX cats is a good thing for both sound and performance and the MAP will improve performance allot if a 325i.and performance and the MAP will improve performance allot if a 325i.
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