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Depending on the engine, an NA motor will sometimes power losses from increasing exhaust piping diameter; the added back pressure removes exhaust gasses from the combustion chamger more efficiently.
Of course, like I said before, this depends on the type of engine, what accessories are installed, etc.
If you're planning on doing a turbo swap down the road anyway, go ahead an just get a 3", because in the long run you'll want one anyway.
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