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Why did you need a "cat-back" system, your truck shouldn't have a cat, unless it started life as a NY or California 235 HP truck, and that was for the '04 model year. The engine pipe on that year is 3.5" to the muffler, and 4" from thereon. If you wan't to use a 4" engine pipe, you'll need the exhaust adapter from an '04.5-'07 truck with the "600" engine and catalytic converter.
The biggest restriction in your exhaust is the turbocharger, its outlet is about the size of a golf ball. This is what you want- note the size difference of the turbine outlet, and it's also a dual volute.
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'83 300D, 126K miles.
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