Like Mike said the rules last year were allowing modification of the pick up points. It was like 1.5" in all directions if I remember correctly.
The new exception rule states:
8.3.8 Provisions for vehicles with Vehicle Identification numbers 0-129
Competition vehicles with VID numbers 0-129 can opt for exemption from
sections 8.1.1.1, 8.3.1, 8.3.2, 8.3.3, and 8.3.4.
In such case the following is true:
• Previously approved modifications of the firewall, subframe and
transmission tunnel, as indicted in the vehicles technical record are
allowed.
• Suspension pick-up points may be moved to within 1” of the OEM
location
• Stock hubs must be used.
“Pre 130” vehicles wishing not to use the 8.3.8 exemption must request a
new VID.
As for the member modification...The way I am interpeting it is that the sub frame may be modified, but can not be compleatly cut in in half, as to retain stock dimentions side to side.
For instance this sub frame...
would be illegal since it had been cut compleatly into three parts and welded back together, but if you did not cut the front plane and just cut out the rack mounting and moved it, then it would be legal.
The only reason I can figure that they went with this is to keep competitors from widening the pick up points.