Well for one thing, the price over stock is better. a set of Che's are cheaper than just 1 arm from the dealer, 2, if your caster needs adjustment for whatever reason, you can finally adjust it cause the boxster doesnt come with caster adjustment and this will give you that... I know there are afew boxsters out there have have bumped a curb or two pretty hard so the passenger front caster is probably negative and the front track arms will allow you to adjust it back forward.
Plus the factory part eventually wears out on the inside of the bearing cartridge and starts to chatter really loud over cracks and bumps in the road.
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