They can still void your warranty if they want ... you do anything to the stock vehicle you run this risk. The onus will be on you to prove your modification did not cause the problem that is subject to the warranty claim if you have one. EG ... there is a fire under the bonnet; you have (or even a licensed auto elec) touched the wiring guess what they'll say? If you blow a diff they probably won't try to say it was the wiring under the bonnet. LOL.
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