For a simple reason I would take the PSS9:- There are a lot of posts (here and on other sites) how to set up properly. Very valueable info! I am sure the KW 3 are awesome as well but not so much documented (for the Boxster) on the net. I had KW on one of my other vehicles and the set up is really nice but I repeat my point, set up info.......
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'14 Boxster
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