Practically instant spool and they make great power into the 500hp range. I also have manifolds/breather mods though. But this would be a great turbo even with stock pipes/aftermarket intercoolers, then you could go full breather mods down the line. Don't waste your time/money on journal bearing turbos. BB's are where it's at.
93 2+2 Twin Turbo Track Build - jsworks.org for more info!