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My car has spent all its life in the Midwest rust belt... But between me, a 1.5 foot quality extension, and like a 4-5 foot breaker bar. My brother was moving the breaker bar while I was keeping everything straight against the nuts. We slathered liquid wrench and being persistent got all the bolts off the manifold without snapping any. I had stainless steel hardware to replace all the nuts and bolts that were being undone so I would recommend doing that.

Having the car on ramps and chocked helped it be that much easier to get in the right angles. You can also screw in brand new o2 sensors once the cats are bolted up. I didn't want to risk hitting them.
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