The SBC on the 05-06 is a concern now that the 10 year extended recall/warranty is coming up. If the pump does go bad, that's a few thousand to fix.
The 07-09 have a DPF that can fail also, and that is expensive to fix. But I'd remove the DPF, if your state doesn't care, and have an ecu tuner flash the computer to operate without it. This would probably also increase your fuel mileage in doing so.

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1983 123.133 California
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