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A 20G is not a big turbo they spool pretty fast, it has a little more flow capability than the EVO III 16G, but it still runs out of steam on the 2.0 at higher boost. The EVO III 16Gs are not nearly as small as the old regular 16G and "Big 16G". People are making around 400whp with the EVO III 16Gs. You were lucky to make 350whp with the old Big 16G. Getting over 425whp out of a 20G takes some work. He already has the EVO III 16G and doesn't want to spend money on something else, that is probably the major reason he is sticking with it.
Why are you running 18psi while breaking in a clutch? You are supposed to take it easy during clutch break-in and not boost the car at all.
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