Noisy Turbocharger

1. Restricted air intake duct to turbocharger compressor.
2. Restricted air outlet duct from compressor to intake manifold.
3. Restricted intake system.
4. Air leak in duct from compressor to intake manifold.
5. Air leak at intake manifold to engine mating surface.
6. Restricted exhaust system.
7. Exhaust gas leak in turbine inlet to exhaust manifold.
8. Exhaust gas leak in turbine outlet ducting.
9. Dirt on compressor wheel and or diffuser vanes.
10. Damaged turbocharger.