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Engine/Power - EJ20T (pre-2006 WRX and JDM)There is replacement for displacement, it is forced induction - OEM 2.0 liter turbo engines in the USDM WRX. 90-94 Legacy Turbo EJ22 turbo engines can also be discussed here.
I'm wondering which downpipe design offers the most HP gains. Right now I'm using a 3" downpipe with a bellmouth. But how does mine compare with a twin dump downpipe, or a downpipe with a blocked off wastegate section?