Oliv,
I wouldn't waste your money on that thing... First its piggy back. Second, its OLD. Third, it does not control boost. It suppose to have a different map to handle different Boost level.. But Most people 5-6 years ago used to call it "purple motor eater".
Being said that, there are always exception and there are very few people with some success.. But compare to Apexi PFC and how cheap PFCs are these days, I wouldn't consider putting one of those.. Now only that, PFC you could use as diagnostic tool as it will give you vital signs of the car where as purple box doesn't.
So, bottomline, I would spend more money and get PFC vs. Purple box.
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