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Now that the warmer weather is here, I finally got to install my Gibson cat-back (#319895 ) on my 97 E350 15-pass.
It was a direct bolt in replacement on my 5.4L even though the system is listed in their catalog for the 6.8L V10.
It took me a couple hours on the driveway, no jacking involved but needed the air tools and the angle-grinder with a cut-off wheel to get the old system off.
It sounds great! Now it's time to see if my mileage improves.