Well mine dont' leak into the cab or anything but they are half way under my bed. YOu will probably also want to position them so they are in the airflow of the underbody.
oh sorry did not know you were talking about that type of cut off : But the guy that does my exahust work has a his cut off positioned in front of his cat and then has a pipe that exits under the rear door (Jeep Cherokee) witth block off there. He says it does wonders but I don't know if he's blowing smoke or not :
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