Increasing oil volume will help to prevent bearing damage and engine failure. Additionally, sustained High RPM use may cause oil starvation at the rod and main bearings The Cosworth High Volume Subaru EJ20/EJ25 series oil pump utilizes a completely new inner and outer 12mm rotorto increase volume by 20%. Suggested applications include drag, track day and race use. Each kit includes an install kit with all required mounting hardware and seals.