Most people use the factory RS adjustable sway bars on 964 and 993.
Upgrading to the RS front drop links is critical on a 964 or 993; have seen many stock front drop links break.
For the rear the primary advantage is convenience - the stock rear drop link is set in molded rubber set at an angle and twisted, and it will only reach two of the three settings. To reach the other end you have to unbolt the drop link and filp them around. When they were unobtaniumm I had Mike Levitas make a set for me; Tarrett Engineering now makes a nicer/less expensive solution.
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2010 911 GT3
1993 911 RS America
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