I'm still mulling over tuning my CDIs. While I have no performance complaints, I guess I'd be happy to get a bit more power. One of my main motivations, though, would be to head off future maintenance issues. The two that come to mind are EGR and the swirl flaps. Are there any other items that come to mind that can be dealt with preemptively via a tune?

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife