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Airaid's removable modular venturi tube eliminates any need for tuning a 'Stang's PCM after the CAI is installed. The slip-fit reducer tube basically returns the inlet to the factory diameter, which assures the engine's air/fuel ratio will be correct at all rpm ranges. When it's time to really make steam, the MVT can be removed for additional airflow. However, without the insert, tuning will be required, as the air increase will cause the air/fuel mixture to be much leaner.