This isn’t your average el cheapo oil filter. This same filter is used in all circuit / road racing Subaru’s all around the world. This STI oil filter was designed for motorsports / racing applications. It has resistance to high oil temperatures. Carbon has been added to prevent deformation of the filter element and damage when the pitch spacer net is under high pressure. Compatible with high-viscosity oil. Cherry red coating, with STI logo.
This same filter is used on all of our drag and road racing WRX & STI cars here at Subaru Genuine Used Auto Parts. We have personally seen an increase up to 3-5 psi of oil pressure (depending on oil weight) which is exactly what you want for racing applications. This filter is extremely rare and hard to find and cannot be purchased at your local dealership. We currently have a limited quantity in stock that is ready to ship.