From there, I hit up Gale Banks, the turbocharging guru and diesel-tuning godfather. When I went searching for more info about the 4.5-liter Duramax, he was the first person who came to mind.

GM canceled its 4.5L V8 LMK turbodiesel Duramax engine in 2009, but now, an early prototype of the ambitious V8 has reemerged ...