I am also going to open it and change catalityc converter as a lot of old exhaust doesnt have paladium, and all the other minerals.. I like brabus for its sound and perfect fit for that little turbo. I have not found any decent shinny exhaust that is good as brabus. However adding just a lambda sensor does not affect to exhaust functionallity..maybe you dont loose certification. However mine is 699cc.. so being strict.. certification is also not valid. But to be honest all these different variations are 100% external the same. They will even not look under the exhaust.
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