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IHI VF43: The IHI VF43 comes stock on the 2007 STi. It has almost identical features of the VF39 with a thrust bearing and a P18 exhaust housing, but the wastegate opening is larger to relieve boost creep issues. The VF43 is capable of 290 whp* on the EJ20. and over 350whp on EJ25
Either replace or remove the inline oil screen as per TSB. If not replaced will cause oil starvation and will not be covered under warranty.