A couple of us in the 4.6L forums are trying to get Eibach to take a look at the problem with their sportline springs and "sagging" issues. I know the kit was made for the fox and 5.0 SN95 as well so any of u with the "Eibach sag" please check out the 4.6L talk forum and get eibach to relize there is something to do about it. I personally have contacted them and they will be doing an investigation. If you own these springs please go to this thread http://forums.stangnet.com/showthread.php?t=609033 make sure to put ur model number and the batch number. Both of them can be found on the springs themselves. Thx