I have a 2021 Subaru Outback with 37000 mi (yup, lots) and I suspect I have an exhaust leak. Exhaust smell not noticable when in motion. When stopped at an intersection or in my drive way, do smell exhaust coming in thru my heating/AC vents. Turn heat/ac off and no smell. Pulled up to the window at McDonalds today and with drivers window down, smelled exhaust. Fairly strong. Anyone experiencing anything similar?? Any ideas on what might be leaking??