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 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife