Flat 4 engine intakes

I always thought that one of the reasons VW-beetles had so much low-down
torque, was because of the long intake plumbing (carby in the between and
raised having to get charge to the opposed heads) , giving a degree of
natural intake boost as the charge flowed towards the heads over
incredibley
long pipes.
The down side of such a set-up is the limitations of high-end revs not
being
able to get the needed volume of A/F. The old VW beetle was not a ground
breaking hi-end performer.

Now we have the Suby, which the earlier motors were pretty tame, but then
came the turbo models. Is it true to say, that these engines need more
boost
to get the 160 odd kws, compared to an inline engine?

Jason