XR6 Series III Irs On Hp motor

[Mangi]

Hi I was trying to figure out a few things about my Series III XR6 about what it basically has.
So Far I know its not LSD (obvious with all the wheel spin lol) so i am going to get it installed!!! Now i have the problem of is my car IRS or not as i have been told that its more expensive to get the IRS LSD installed. (Not sure why maybe someone could explain that to me to). Now looking at the brochures which are located on this site: http://www.fordforums.com.au/photos/...cat=602&page=1
it says that the XR6 hp is not even optioned with IRS.
Is this true?
I was under the impression that my XR6 did have IRS as it has been lowered and has camber kit.
Is it possible for my car to be lowered with camber kit but not have IRS?
Was it possible to get the Series III XR6 non VCT with IRS?

Any help will be great...