Depends on your application for the most part. Is this a street machine, drag racer or road racer? I understand that the lowers are most important in launching in a straight line and the uppers are more critical in controlling sway in sharp turns. I've got the Factory Five lowers installed on mine and I'll do the uppers when I accumulate more patience as the bolts are rusted f-ing shut. Most of the guys I know who are into carving corners have gone with the more expensive adjustable control arms that they can "tune" to road conditions. If your going to throw on sub frames I would think it would be no big deal to have the torque boxes welded at the same time, but that's just a guess.
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91 LX 5.0
Z t-5, 3:73 gear, Vortech 73mm Mass Air, Accufab 65mm TB, BBK underdrives, Crane HI-6S Ignition, BBK unequal length headers, Bassani x pipe, 2.5" Dynomax Super Turbo cat back, Kenny Brown Super Subs, Factory Five Control Arms, Mac cold air kit and more to come!
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