jacking rails??
 

Besides a convient jacking location, are they good for anything else like more chassis support? the add claims they are, but can they be used with my subframes that are alrteady installed? thnx:)

I feel like i need more stiffness, in the car that is lol.

I'm not sure if they add any more stiffness to the car, although I would think they would.
They seem to be VERY convienient for jacking the car up on one side. Kenny Brown had a display at a carshow that I was at and this stang had one side about 3-4 feet in the air and it was only being supported by a jack on those rails.

Do you already have the K-brace and strut tower brace? If not, those will probably give you much more support than the jacking rails.

I'm running the Kenny Brown jacking rails and I really like them. These fox cars need all the help they can get when it comes to chassis support especially when you start getting into the 12's or even lower. They were cheap and easy to weld in also. You may not notice a big difference like you would with subframe connectors, but every little bit helps.

thats the answer im looking for, but they can be welded around the subframes correct? no i dont have the k-brace or strut tower, i do only dragracing, and everyday driving. thnx...

They are welded right along the inside of the existing pinch welds. You will have to slightly reposition your fuel line to put the rails in though, but its easy.