Yes the changer has an aux slot at the back.
About the steering logo, you can get a new centre piece. I tried the mugen type red sticker but didn't work for me.
As far as shopkeeper deducting the changer he will offer you 5000 saying: "sir is ki toh demand hi nahi hai" and in future when or if your navigation system goes faulty and you decide to get a changer back you will be paying about 15000 to buy it back second hand as the shopkeeper will then say: "sir yeh original hai is liye mehnga hai". So my advice is, keep it with you as its not worth letting it go for 5000
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