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      02-02-2011, 04:32 PM   #1
andrew520d
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Drives: f11 520d
Join Date: Dec 2010
Location: ireland

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chipexpress tuning box for f10 520d. Traceable?

I came across a company called chipexpress that make a tuning box that they claim improves performance and economy of the 520d and can be removed and will not be traceable afterwards.
Does anybody know if their claims are correct or if theyare worth having?