Must have! If you have an OEM radio connected to the vehicle database or if you have a factory audio system with a premium amplifier and want to keep it. I have a Chrysler 300 and wanted to fit a non-original hu (Pioneer avh-p3400bh). I bought this can bus wiring harness and installed it. The audio from the radio is a bit distorted so I adjusted the potentiometer. Sounds better than Oem Boston Acoustic hu. I would give it 5 stars but the instructions can be seriously confusing if you are new to the install. So if you live in Fort Worth, Texas and need to install an XPI CUSTOMS search on Craigslist, I can help you over the phone for free or you can bring it to me and I'll install it for a fee. Anyone who can find me on Craigslist can write or email me with questions and I'll help you for free. If you decide to do it on your own, take every precaution, installing it incorrectly can seriously damage your car's data system. I will also reply to all replies to this review. This is the one to buy if you want to use the fade option on your xy don't buy another brand's non-fade option. Read specs and reviews before you buy, and if you're new, ask an experienced installer what your options are. Thank you for reading my review. Device
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