Is it needed to install intercooler in diesel engine turbo charger?

Yes, installing an intercooler in a diesel engine with a turbocharger is beneficial. The intercooler helps to cool the compressed air from the turbocharger before it enters the engine, reducing intake air temperature and increasing air density. This improves combustion efficiency, enhances power output, and helps prevent engine knock. Additionally, cooler air can lead to reduced emissions and better overall engine performance.