I'm live in Dunwooody GA and would be happy to show off any of the mods I've made. I'm probably not the best person to tap the oil pan for you but I can share my experiences.
I've seen no issues with emissions since the CRD doesn't have to have it done. As for vehicle inspections, GA has none.... (sometimes I wish it did for some of the POSs out there...).
Let me know in PM if you'd like to exchange info.
Dan
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2005 Silver CRD Limited
245/75R16 GoodYear Duratracs
Fumoto drain | ProVent CCV Filter
Stanadyne FM100 filter | Cummins fuel pump
GDE Eco | SEGR | BoulderBars | FrankenLift | Frankenskids