Is it ok to have music system from outside in active? Dealer always quote high while adding accessories and not want to go with them. I'm more worried about warranty point of view. I know if they cut wires then warranty would void but my accessory installer say that they would do socket wiring only. Anyhow, I've already got rear parking sensors from him and has been running very fine since 8-9 months and no issue with car. I know central locking is much more complex to be done from outside and I would also not want to spend 10K as per Fiat (its only 3k job).