So I'm not 100%, but I don't believe the "GT2971R" is an actual in-house Garrett turbo. The wording makes it sound like It is a custom built unit using a modified Garrett comp Housing. Since the comp wheel is slightly larger, I would be somewhat skeptical as to whether it is a genuine Garrett part. In my humble opinion, I would not purchase that unit until you hear from Garrett. If it is a 'custom' built turbo using Garrett parts, there is no way to know that the unit was dynamically balanced together. If it was not, then you could be looking at a turbo going bad waay sooner than it should. Another thing, since the comp is larger, you don't really know if it is similar to a Garrett wheel, therefore you don't know if it has the same weight or aero qualities, so it could very well perform quite differently than the GT28.
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