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Hi, I have 1996 Mitsubishi Lancer CK2 (Auto transmission, already with all Evo 4 bodykit), now I would like to get a Evo 4 exhaust muffler installed to get the Evo 4 beat. Planning to get a original Evo 4 silencer which is a used one. Have few questions, Will this really impact fuel economy (I know some people say it does and some say not at all), just like to hear from the community here. Will there be any tendency to get my car failed from the emission test (if the condition of the muffler is good, and i'm not replacing my existing catalyst converter section in the exhaust system) ? Is there any suggestions or recommendations you guys have in this regard for me before I get it done ? PS. I'm not using my car for racing purposes. Thanks in advance,