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Only if it's the root cause. Rules also change from country to country so I would look into that.
In CA, it must be proven by the manufacturer that the modification was the cause of the damage. So for example, if you suspension clunks and you have JB4, BMW cannot simply blame the JB4 and not help you. However, if you experience ecu issues, and repairs are required, this is where they will most likely ask you to pay out of pocket and possibly void the rest of your powertrain warranty.
The good news is that Dinan and Burger products have been proven and rarely cause issues. Take a look at the F30 forums, very rare for these products to damage something, the G20 is no different.
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