Perrin Sump Restrictor WRX / Forester / Outback / Legacy

Many People Experience a burning oil problem, or blue coming from their exhaust. This problem can get potentially worse with exhaust modification. The installation of this product can have an affect on exhaust pressure, preventing oil from slipping past the turbo seals. The sump restrictor makes the turbo sump more affective at sucking oil, finding a proper balance between vacuum and exhaust pressure.