I think i've heard mentions of setups, where ppl will spray nitrous, for low end torque, until the turbo spools, and then takes over for the upper revs, anyone heard this?

-PHiZ

And what's the deal with sequential turboes. I think, one is calibrated to spool low RPM, and the other at high. However, when the high rpm is spooled, I would imagine the low-rpm turbo is causing an air restriction... I can only imagine they are a bitch to tune....