getting an exhaust + aftermarket intake + headers will only shift the power towards the upper RPM band and most likely take away from lower end torque.

as for a turbocharger, how the hell is that increasing your low-end torque?? u don't make power until u can make exhaust pressure and that won't spool the turbo until at least 3k. a supercharger will technically not lag like a turbo, so u might gain a bit of low-stuff, and nos will def give u a little boost as well.

the best way to gain low end torque is to find yourself an h22a.

gug