Yeah, it turns out the 2.5XTR plots are a little hard to find on EFI or COBB's databases. My point was basically exactly what you said. A bigger turbo at 20-22psi and a stock redline is pretty pointless. But there are many people that only want to run 20-22psi and a stock redline, so (IMO) they're often better suited for the smaller turbo that will be more responsive.