[Ender]

When I was still using a Thrush Turbo muffler as a midpipe on my otherwise open 2.5" exhaust (w/ two mufflers after a y-pipe) I was able to creep to 12psi boost for a brief moment, but then it'd plummet down to 5-6psi, even in the high gears. That Thrush pos reduces to about 1.75" inside, yet I was able to hit some wicked boost (but only for a moment) before all that air got compressed into the three feet of pipe before the restriction point. I don't doubt this would work similarly, but with even worse effects. First, when you romp on the throttle you won't boost quickly, your basically NA motor will be fighting to cram a bunch of air to drive a turbine (which will certainly resist, and more so as it spins faster). So then, once it's actually spooling, the turbo will have to play the same game to get the compressed intake charge into the chambers. I would bet that such a system may not benefit you AT ALL in first or second gear, and maybe minimally in third. And when you shift, your compressed intake charge will have to be vented and the only thing you'll have going for you is the turbo is at least still halfway spooled up. I'd be curious to see this done just for kicks, but I don't see any real practicality in it. Compared with a standard under-hood turbo setup, you'd almost certainly sacrifice power gains, you'd fight things like lag, it could end up costing more than if you'd just used an intercooler (look at all the labor and piping it takes to do this)...