You need different lengths wrenches. I picked up a set of shorty wrenches that helped out a little. Just keep working at it and it will come off. The easiest way is to lower the engine by about 3 inches but not everybody has a lift to do this. But it can be done with the engine in place just make sure you get everything straight before tightning the bolts on the headers during installation. As far as putting on the cats to the headers you can clear putting them on together but it will take two people to hold it into place from the bottom to get the bolts started and hold it until you get them tight to ensure a good seal.
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