2005 MAY HAVE IRS option... may...
This is somewhat speclation as the document I am referring to doesn't actuallly say IRS, but does say "New Suspension (TBD) optional handling suspension on GT" This is from a Ford Dealer Order Guide draft. It can be had and reviewed here: http://bradbarnett.net/mustangs/timeline/05/05/OrderGuide.pdf
I hope it is an option. I, personally, always felt the live axle was a handling limitation of the stang.
There is also no 18"wheel option available.
This is somewhat speclation as the document I am referring to doesn't actuallly say IRS, but does say "New Suspension (TBD) optional handling suspension on GT" This is from a Ford Dealer Order Guide draft. It can be had and reviewed here: http://bradbarnett.net/mustangs/timeline/05/05/OrderGuide.pdf
I hope it is an option. I, personally, always felt the live axle was a handling limitation of the stang.
There is also no 18"wheel option available.