I wouldnt say best mod, but very smart move before dumping money into your motor. they are steel square, or sometimes tube (depending on brand) rails that are welded or bolted, (dont bolt them)to your subframe to the whatever its called, i guess the rear part of your frame under the car, like where you would put your jack, i have rode in a 85 stang with some custom welded subs, lemme tell ya, that car rode smoother, handled better, accelerated a little quicker...well just felt more responsive to traction, and can get rid of rattles you may have in the interior. "unwanted flex" is what they advertise it cures, especialy on a unibody chassis.
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