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Old 07-30-2009, 01:17 AM   #46
Back Road Runner
Scooby Guru
Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
2004 Forester STI


The difference is in the displacement. The turbo will flow the same on either engine. You'll have a certain cfm needed to spool up and a certain max cfm where it drops off. On a 2.5L, you would effectively spool up a little earlier and roll off a little earlier. the difference is simply a factor of that extra 12.5% flowing through.
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