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Do you have a 2 channel kit?

If you do I would use the 2 o2 bungs and weld them right after the headers (before the cat) on the top; theoreticaly thats the best spot for both channels...

And if you only have a 1 channel then I guess at the Y of the exhaust but your gonna have to go cat-less or the reading will be inacurate...

What are you using to tune?
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