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The dreaded tuning box. Is there a product that divides opinions more? The truth is if you understand the limitations and the purpose of tuning boxes they have their place in the car tuning landscape as much as any other power adder like turbos and camshafts.
Tuning boxes are designed to work with cars that are using the factory engine parts. If you accept this then they will do a job for you. If you are changing cams and turbos then they will cause problems.
Every product has its intended use, if you stick to the manufacturer recommendations use a tuning box will give you more power.