Scruffy- Thats the thing, this thread is an info gatherer, ie what hits what, whats the limit of what, etc etc.
On all cars the rack will go further, its usually stops fitted to certain parts of the car (rack, arms, whatever) that stop it, for whatever reason.
And like said, just need longer tie/track rods to increase the angle providing there no stops to hit.

Cant just remove all stops tho, as youd simply hit the end of the notched section of the rack and lose all steering feel.

Certain theres a sensible money solution as-
A- There are on almost every other car in existance.
B- Markk's 3dr rallycar has LOADS of angle, but he dont seem to want to say exactly how its done.