Hi! I'm planning to retrofit an Audio 20 NTG 2.5 from eBay into my 2004 SLK 200K. However, after tons of reading (thanks a lot for all your helpful posts), I still have a big worry: what about the auto theft Protection, when I buy a used unit from eBay?

Cheers!

 

I have bought from ebay a NTG 2 Audio 20 and it was ok. Plug and play.
Just do it. It worth.

 

Thanks! I installed a NTG2 Audio 20 a couple of weeks ago and it's perfect