the "stacked" induction is a great concept, but it was tried 40-50 years ago and was in production engines and it was dumped because IT DIDN'T work (detroit diesel, twin/ single turbo with Jimmy blowers). It's not as efficient as a bi-turbo (sequential) or a straight up twin set-up. It will create higher BOOST levels in the intake, which doesn't necessarily mean HP. Boost just means a whole bunch of cylinder pressure and heat, both which KILL engines. Take the impellers outta the blower and see what happens. IATs would almost HAVE to be in the toilet at 40 PSI intake pressure (actual IATs and boost in manifold, depending on where the sensor is mounted, it may/ may not be a logged PID) You can get anything to make big power on the dyno, but put it on a road course in 5th and you'll have an express ticket to kaboomland, especially on pump gas. And the "stacked" induction WILL see a higher pressure ratio after the supercharger than it does previous to it (it is generally a 1.2-1.5 pressure ratio increase). 1000 to the tire is ALOT on any pump gas, you are approaching 4HP per cu in flywheel- name a production engine that will HOLD UP to that... These are great engines but they were built by laborers in Detroit, not the Lord in heaven. I commend anyone who tries anything different- that is how advances are made!!!