here's a link to a Porsche 930 with a vvt turbo upgrade:
http://aerocharger.com/porsche-930-vvt-conversions-are-finally-here/
a machine they called the widowmaker because of the turbo lag. look at what the vvt turbo does to the dyno - no turbo lag here. and that's on a 1986 car.
if engine sound is the issue, look at what Porsche is doing with the 991:
Faking It: Engine-Sound Enhancement Explained - Tech Dept. - Car and Driver