You have enough miles that it shouldn't be burnoff BUT a HFC is generally going to have SOME smell to it. More than likely you have an exhaust leak from the install or possibly something burning on the pipe. Check for bags and things of that nature and tighten up every bolt on the exhaust. Also check to make sure you have an even mount on all the flanges... if a hack shop tightened one bolt completely it is possible the flange isn't sitting right.
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