Originally Posted by 180sx-I
Things to check for:
- O2 sensor connection
- Piping connections from turbo to intake manifold
- Vaccum hose from actuator to boost controller to intake manifold
- Vaccum hose for blow off valve
- Plug for Mass Air Sensor
- Connections for piping on air filter
+1 but the best way to check for vacuum leaks is to pressurize your whole system with compressed air then you will be able to hear it right away instead of assuming you checked every line for visible leaks.