If you are hearing a loud metalic chatter noise in your suspension while rolling over bumps, it could be very likely your Front & Rear Upper control arm/Track Arm bushing cartridges are worn out... I use to have a metalic chatter coming from my suspension at low speeds of 50mph or lower while rolling over bumps or cracks in the road... Turns out my front and rear track arms were worn out. I replaced them with adjustibles from Delubozparts (forum sponser). The Adjustibles are a cheap alternative at $269 a set, to buying OEM non-adjustible units at $600+ a set.
Also, if you plan on lowering your Boxster you will run in to issues with rear Toe and the factory toe links not having enough adjustibility to correct that, so by using the Rear Upper Control Arm/Track Arm (Caster) adjustibility you can correct the excessive positive toe you will have from lowering the car.
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