They make more power, but not as much as the advertised gain due to housing restrictions. I have not done an A/B test since they are pretty new. But a Stage 3 to a Gen 2 GTX3071r is a 150hp upgrade.
If "they make more power with the same spool" isn't good enough I can share some dyno results. But I dont know the OP, and as a first post im not going to just pour out data, Lately everyone seems to like to steal my IP for their own gain.
If more data would make you change your buying decision, then great, I can provide data that your looking for. But since its new I spent a good deal of time and money in it for someone to claim it as their own.