Head Unit Question
First of all, the site is great. I just went and visited the closest Radio Active store location in my area about upgrading my stock cd player to a new alpine head unit.
However, the guy running the store told me that I needed to pay extra for a GM Data Bus Adapter. He told me that it could cost $99, $199, or $299 (Depending on which type I need). I dont remember exactly why he said I need it because it did not make sense to me, but he said that the newer models of GM, especially cobalts needed this upgrade due to some information passes through the stock head unit on my car. Therefore, he said since I am taking out the head unit, I need to install this adapter.
I have installed an alpine head unit on a 97 pontiac sunfire and I did not need this upgrade and this is why it did not make sense. Before I buy into this, I was wondering if anyone could shed some light on this subject. Any advice or information would be appreciated? Thanks.