Is it powerful? Nope!
Is it clean? Nope!
Is it naturally aspirated? You bet it is.
I present to you, the incredible naturally aspirated Gavril 6.0L diesel V8. With an mind-blowing 135 horsepower and 291 lb-ft of torque, this engine is guaranteed to leave you wishing for more power. But hey, now that the engine has lost its one redeeming feature, at least it will last forever, right? Right?
The engine is available for the Gavril D-Series, H-Series, and Roamer. To use it, open engine configuration and select "Stock Intake," which will remove the turbocharger. However, there is still a turbocharger modeled in the engine bay, as I am not familiar enough with the game's 3D work to remove it.
A torque curve for you, good sir.