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I would just like to say that stay away form those "piggy box" tuning boxes. They are always one kind of shortcuts to get more power. If you just have a change, take your car to a proper dyno and get it tuned properly or if not possible, just get a ready flash/chip.
At least here in Europe I haven't heard of any good tuning boxes that would take all the important factors into consideration when it comes to adding power. Normally they just give wrong information to ECU and make it give more fuel and boost.
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