ETS 04-07 Subaru STI Intake Kit

This intake places the filter in the fender well and gives the 2004–2007 STI turbo a larger, smoother inlet path. I'd use it when airflow demand increases and I want the filter away from engine-bay heat.

The stock-MAF option retains the sensor but still needs calibration suited to the intake; speed density is for a car configured to calculate load from pressure and temperature sensors. Choose the arrangement that matches the ECU setup and coordinate the change with your tuner.