Y pipes usually have a donut that can go bad. You will have to get a chain whip saw, which you can get on loan form any Advance Auto ro Auto Zone, and cut out the section of pipe and disconnect it at the flange. Make sure you soak the flange bolts as long as possible and wipe them off the remove rust so they don't break. Use WD40 or PB Blaster is even better. The to re0-install you will have to get aa pipe adapeter to make up for the section where you sut it unless you have acess to a welder.
It is not a hard job, just tediuous and it can be frustrating. The best thing to make it easy is to soak and wipe the flange bolts as much as possible and at least let it soak ovenight once. The more you do this the better.
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Monday, November 19th, 2012 AT 6:07 AM