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Discussion Starter · #1 ·
i have a 2004 wrx 2.0 MT with the sf cobb intake, HKS flat flange catless downpipe, and a spec D CBE. im not sure to run the stage 2 ACN 91 octane or? i am from cali. thank you
 

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i did run it on the acn 91 stage 2 that the v3 AP already provides but didnt notice power gain
Well, that's the really

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Acn91 is what it is. You can possibly get a Dyno tune to get you a little more or convert to e85 but not as much headroom with that fuel.

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