Great choice of turbo. If you want the room to grow, the .82A/R turbine housing is a good choice.
If you were going to keep the A3 I would've suggested to keep the A/R of the turbine housing slightly smaller to help with spool time, but since you're planning to build around the turbo later the .82A/R will help you reach peak HP goals with a more efficient and/or higher revving engine.
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