Note that the following was taken directly from the link you posted.
Quote:
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If you race a uni-body car, the use of subframe connectors is absolutely essential. Uni-body chassis’ can suffer severe flex and twist when launched. Our WELD- IN connectors are made from mild steel and precision formed to fit without modifications to the floor or other factory components while increasing the chassis stiffness necessary for a consistent working suspension. Installation can be done in half the time of other connectors. Bolt-in connectors just simply can't provide the same degree of stiffness and get looser with every launch.
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I don't know about you, but based on the picture at the link you posted (granted it was for a 1st gen) and that statement above, I'm thinking half the installation time means half the contact points, which means half as strong.

Mike