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I replaced my catalytic converter on an "89 740 Sedan a couple of years ago. I purchased it from FCP (at that time) now they are named FCP Euro- but they still have the catalytic converter. You can also get them on ebay (http://www.ebay.com/sch/i.html?_trksid=p2050601.m570.l1313.TR0.TRC0.X1989+Volvo+740+catalytic+converter&_nkw=1989+Volvo+740+catalytic+converter&_sacat=0&_from=R40
you will have to modify it to fit and unless you know how to weld, it can be difficult.
The metal in the exhaust pies is a cast steel so you can't use a lot of heat to form the weld.
You will need the pipe extension from the old tail pipe to use on the new one. Also the flange bolts may need to be replaced, and they are a press fit, You may not be able to get the old ones off. so be careful in taking the old ones off, or loosening the nuts- if the nuts are corroded, replace them with new but they have to be high tensile steel nuts with a shoulder (or should be).
If you go to a muffler shop, they may not have the patience to fit the converter into place, so make sure they do a good job.
Good luck.
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89-740 GLE;91-940 Sedan ;98-V90 Wagon ___ all running well
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