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Thanks to Steve Ringlee and others who belped with the project.
This was the easiest and most satisfying Volvo job in the last 14 yrs. of Volvo tinkering! Car is quiet and feels more powerful.
For those interested in the details.............
Used a Volvo OE kit from Borton ($230 delivered). Bought an exhasut pipe cutter ($20, basically a chain with a bunch of tubing cutter wheels on the links and a screw mechanism to tighten around the pipe). Pipe cutter was so much fun, I ended up cutting the old exhaust into very short sections for very easy removal. Used my Dremel tool with reinforced cutoff wheels to buzz through any old mounting clamps or hangers.
I had asked for jacking advice; most folks said to use ramps at the front, but I couldn't find a high quality set locally and there was a snowstorm coming, so I just jacked up the rear from the differential and used jackstands under the factory jack points. Worked out there was plenty of working room because the exhaust on the 740 is so close to the right side of the car, and the cat pipe comes back quite far.
Fit of the Volvo exhaust kit was superb--nothing banged, rattled, leaked, or buzzed. Only mistake I made was not realizing that the cat pipe clamp is 58 mm, all the rest are a few mm larger. That cost me about 15 minutes to figure out and reinstall some clamps.
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