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The better performance and cooler exhaust temp claims are very much true. How much improvement you'll see will depend on how restrictive your factory system was. There's lots of internet message boards dedicated to deisel engined pickups and improving their longevity/performance. Myself I drive a 98 Chevy dually with the older 6.5l deisel, but I'll share my exhaust experiences with ya just for informations sake, and you can make your own decisions from there: Mine came stock with a 2 1/2" system. I replaced it all from the turbo on back with 3 1/2. I bought an 8ft peice of straight aluminized exhaust tubing from a local shop, and three 90-degree mandrel bent bends from Summit Racing and a mandrel-bent 3inch downpipe from an aftermarket diesel place. Welded it all up myself, was an easy job, it fit well, and has gone 3 years no with no trouble. It's common on turbo diesels to just run straight pipes(no muffler or cat) so that's what I did. The turbo basically acts as a muffler and deadens the sharp exhaust noise. It's about as loud as a gas motor with glasspack mufflers. It helped towing performance a ton, and although I didnt have an exhaust gas temp guage with the stock system, others have said it helped that a lot too. Not sure if you're wanting to go this route, but it's an option, even if you have a local exhaust shop do it(although legally they may resist removing the cat converter- which on a deisel is really just a "soot trap" anyway).
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