Given the relatively light weight of the sub-frame connectors, they are definately worth it. You would be adding maybe 15 lbs. to your Stang - which is not much at all. Plus they are a must when you start to approach higher power levels with drag or road racing.
My advice is get them. I have them and like them.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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