The sensor is already partially extended.. you may or may not need the L bungs depending on whether you throw a code... after a few hundred miles I didnt throw one (then got UpRev'd and it turned the sensor off regardless).
You're looking at 300 plus tax, don't worry about the bungs yet.
Side note, no cats come with those bent housings and used Berks/Stillens still typically go for over $300.
Just my 2 cents.
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