[vujade]

the reason you want to use a narrow beam to keep your turning radius stock is that Porsche Brakes, Dropped Spindles and most rims widen your track width, which increases your turning radius and makes it more difficult to turn (no power steering).

By narrowing the beam say 2 to 3 inches you are able to offset the increases made by your modifications.

Dropped Spindles widen your track 1/4" per side or 1/2" total
Disk Brakes widen your track min 1/4" per side or min 1/2" total (sometimes 1")
17 x 7" rims widen your track min 1" per side or min 2" total (sometimes more, depending on rim offset)