hiway tractors (semis) have big engines and turbos. Heavy equipment also.
Supercharging, of any kind would allow a lower cruise rpm, dual but Staged turbos could cover both ends.
Just a thought.
cummins tried duel turbos on the bc2 475s in the early 80s and didnt work good, most were converted back to a single 3bht holset, cat tried it in early 2000s and didnt work, most got converted to a single big borg-warner!!
