Comment by jcgrillo

The U.S. diesel tuning crowd seemingly never discuss air/fuel ratios. This is a huge mistake. Also it's important to understand how much torque your transmission is rated for and to not stray beyond it. It's possible to reliably extract more performance than the manufacturer supplied but you have to understand what you're getting into. Turning it up to 11 and "rolling coal" is gonna get expensive, and it's super dumb.