[s-cars] Sequential Turbocharging

[Steve Voit]

I've read that BMW will be using a sequential turbo set-up on some future
car where both a small and large turbo are used.  VW is doing the same on a
1.1 engine in a small car.  My memory is lousy so that's all I recall.  

What needs to happen in the industry at large, or in our circle of s-heads,
for us to have a realistic shot at doing this in our cars?  I can't get the
thought of low-lag and high-output out of my s-head; I want power w/o giving
up response at lower revs.  Would doing this today amount to integration of
known components, or rather, do new (reliable, affordable, mass-produced)
components need to come to market first?

Assuming the bits are available how tough would it be in terms of skills,
man months, budget?  I know Porsche gets credit for the integration we call
RS2;  is it feasible for a smaller group to do this with sequential
turbocharging?

The ultimate group buy - x months with a tuner shop to design/engineer a
solution to the RS2 level of satisfaction.

Any thoughts?

Steve, bein' careful not to inhale while thinkin' out loud (with no dahkine
nuttin') in Seattle, V.