Interesting subject,

If it's a quicker turn from lock to lock you want there is another way. (nzdatman, did we discuss this a few years ago)

I know alot of people may not agree with this way but you can shorten your lower steering arms, this will give you a quicker lock to lock.

I have done this mod twice now on two of my rallycars with great success.

I must stress that this mod is NOT one to be even considered unless you have the relevant metallurgy knowledge and the correct welders to do the job properly.
It's not just a matter of cutting up your lower control arms and welding them up with the good ol' arc welder with GP rods under the house.
If not done correctly it can be very dangerous.