If you purchase a full catback exhaust, all you need to do is turn a wrench and pull. Pretty much a bolt on affair, though it will require some effort. Only reason it would be harder is if your bolts are rusted on or stripped. Or if the exhaust doesn't match up well (though most 240 exhausts seem well made). Plus they'll include new gaskets and bolts.
If you're just looking at a new muffler then you'll probably need to go to mieneke or something so they can cut off the old and weld on the new.
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Steve
93 240sx FB currently very clean and for sale
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