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Not that I'm anti-pollution control, but emissions exempt would open a lot of doors. I don't know how extensive the mods required are for stratified charge injection, but if a piston redesign would do it, that would be pretty cheap and allow ridiculous lean mixes. They were essentially outlawed ages ago due to, obviously, high NOx. The Honda CVCC (Controlled Vortex Combustion Chamber) used SCI. There's probably some kind of trickery with the cams and head design also, but I've never torn one apart.
It also allows free reign in regards to importing foreign engines from small TDIs to GDI, though I know you said you're not interested in that. I guess I'm just thinking for myself. The Subaru 2.0 diesel would be interesting.
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