This document discusses digital twin spark ignition (DTS-I) technology used in engines. It describes how DTS-I uses two spark plugs per cylinder to improve combustion efficiency and engine performance. The document outlines several advancements in DTS-I technology including digital twin spark with swirl induction or fuel injection. It also discusses intelligent coil ignition and variable ignition timing systems. Emission and efficiency benefits of DTS-I over single spark engines are presented.