As Bill said they will void your warranty. Any performance enhancing equipment you put on, even if you take it off, leaves a footprint, so to speak, on the computer and they will know it had something on it. Now, I'm told there are some gizmos that can be installed on some of the sensors that will help with fuel economy and regeneration and won't leave a print on the computer but you would have to know where they are so you could remove them before you take it in for service.
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