I've thought similar with regards to the bmw engine. Especially that it's deliberately throttled down with a teenie tiny turbo and the injectors.
Did they not develop a 'state of the art 6cyl' diesel that they sold on to GM Europe that wasn't good enough for their own vehicles?
Then there's the catalytic EU3 to 4 that was taken into account in development but never implemented,possibly even making EU3 approval invalid in the first place
Look through any parts catalogue, there Should be a pre-cat.... Yet to see one
Back on subject though, yes! Get a 160 map done, it transforms the car
