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even when cold
Knock control not available on this ECU
The larger the AOS
(3) 3M double sided tape
improved oil entry
Perrin Sump Restrictor WRX / Forester / Outback / Legacy Style:18-22 WRX / 18-19 Forester XT / 20-23 Legacy & Outback even when coldMany 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.
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