Big red tube: Better air flow therefore more power. About 10hp
the red crossbar between the strut is for stability
And the little red bar is to hold the engine during strong acceleration.
Highly unlikely without a tune. Airflow is already optimized, Subaru engineers wouldn’t have left 10hp on the table if all it took is a a different pipe.
Were these installed at the same time? I am interested to know what the difference was for the strut bar? And then the pitch stop, was there any additional NVH?
