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Engine/Power - non turbo (All non turbo Imprezas)Who needs a turbo when you have 2500cc? Cams, intakes, exhausts, etc. The 2.2L and 1.8L Subies are cool too.
Depends on what you are driving. I'm assuming an RS since you are in this forum. What do you want? Is noise going to be an issue and what about fitment.