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For turbo, the best exhaust is NO exhaust (figuratively speaking). Make it as short as possible, with proper diameter piping. The turbo spools based on a pressure differential between volute pressure and outlet pressure. So 3" systems will give better response and quicker spool than a comparable 2.5" setup.
But there are compromises we all make concerning sound, emissions legality, safety etc. I would go full 3" on a turbo. It won't be quiet, but with the right muffler setup it won't be too bad. The turbo soaks up a lot of noise as well. Bonus of having a turbo.
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