If you have an S engine you will have a change-over valve for the air injection on the air box.
It is simple and easy to replace and can be done in under an hour.
rubber vacuum hose that attaches to the hard lines can get really stuck onto the valve. I recommend removing the complete airbox to help with the hose removal. It is also a good idea to have some extra hose on hand if you damage yours getting it off.
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