Not necessarily. I took a look at a supplier and if you have the same engine, the front pipe is the same number. It is very likely that since the car bodies of these two are from the same series first generation Outback, and they have the same engine, the exhaust will interchange.
It may be the heat shields on the exhaust system vibrating.
Oxygen sensors on all cars built in the last 20 years or so are located in the exhaust system. Subaru has them before and after the front catalytic converter.
Catalytic converters are in the exhaust system so replacing them is a job similar to replacing a muffler. Difference is that the converters are bolted in and have gaskets that must be replaced at the same time.
We'll assume that the hiss was not there before. Could be an exhaust leak or a leak or restriction in the air induction system. Would help to know if you experience the hiss from the driver's seat or outside of the car.
http://www.cars101.com/subaru/keyless.html#code%20alarm Should do it for ya...
You need to burp the radiator and cooling system.
The Emergency Killswitch in the Subaru Outback is located underneath the drivers-side steering panel. It is to the left of the steering column and looks like an inconspicuous button. Just press that with the keys in the ignition and with the electricity on.
The system requires between 1.3 & 1.5 lb of HFC-134a refrigerant...
There is only one catalytic converter in the exhaust system.
Most likely a problem in the emission control system Have vehicle scanned to determine the problem
The procedure is covered in your owner's manual. If you don't have one you can download a .pdf file.
It is the tire pressure monitoring system.... it's means check your air pressure in your tires!!