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In the era of sustainable engines where the need of high power, torque, engine life is increasing while eliminating BSFC and emission concerns, the variable length intake manifold system helps to provide optimized intake system. The research consists of adopting continuous variable length intake manifold on diesel engines where compression and suction waves provide better swirl and pressurization methodology. The continuous varying intake manifold helps to provide better volumetric efficiency by more than 100% as constructive waves provide improved swirling which leads to reducing detonation and better combustion. The manifold path changes with every range of rpm through operating butterfly valve, which also guides air intake path according to engine load. The air flow is increased at low rpm bypassing the intake air from the long and narrow path to increase low-speed torque.