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These "off-the-shelf" chips were popular in the '90s, less so now because people realised that they were a waste of money.

On a non-turbo car, all they do is disable the over-run cutoff, which improves throttle response a little bit, giving the "illusion" of more BHP, at the expense of fuel economy.

On a turbo'd car, fitting an off-the-shelf chip can be dangerous to the engine. There were many Sierra Cosworths blown up in the '90s through using these things.

Go for a custom remap instead.

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