The process of delivering compressed, denser air to a combustion engine is referred to as forced induction. The air is run through a compressor connected to the intake manifold of the engine to create a more efficient fuel burn which will eventually produce more power. In airplane engines, turbochargers are popularly used to achieve forced induction. The turbocharger is connected to both the exhaust and intake manifolds of the engine. It uses spent exhaust gases to run the compressor, which draws in and compresses clean air to deliver to the engine.