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IMO.. take the car to a muffler shop and get a Dynomax w/ mufflershop piping.. (mandrel bent if they do it).. they're pretty quiet and flow well..
I'd actually go for a 3" exhaust; and 2.5" only if they don't have 3"
Checked out your build. Nice re-build of the motor. Did you dyno it with the turbo yet?