I didn't need more than the factory rear bar before I hit 1.3's. With a heavier car you might need stronger sooner.
I did remove the factory rear bar with the installation of this bar. If this bar is designed right I shouldn't need both.
I'm still runing my factory control arms with polyurethane bushings. This works fine for me so far.
I do have the Eibach rear drag spring kit with air bags.
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