Reddit mentions of iSimple IS32 TranzIt USB Universal Car FM Radio Integration for MP3 Players, Smartphones, and Tablets

I installed one of these and it works great for me. It basically plugs inline into the antenna and broadcasts directly to the antenna. Then you tube your radio to that station. I've never had a problem with it. Plus it adds a charging port in the car.

Get a IS32 and it will come with everything needed to flush mount it.

Alternatively you can get this module and this harness to get better than FM quality aux in.

I'd recommend using a LOC that has a signal sensing turn on built into it unless you know where your going to get your switched 12 volt to turn on your amp with. The data signal that your truck has makes aftermarket life a little more difficult than it needs to be.

I'd also caution you against buying from Amazon because they aren't a official retailer for kicker products. That means you have no guarantee you aren't getting used, refurbished, or knock off products. And if you do a new legit product it won't have a manufactures warranty on it, so if you do need to go to kicker for any kind of service they won't help you and Amazon will tell you to deal with the seller on their site you bought the product from.

Get something like this. Goes directly inline with the antenna so you won't have clarity issues like you would a normal FM transmitter. I assume you're gonna need these as well but I couldn't be sure w/o actually seeing the antenna plug for your radio.

I wired this into my last Crown Vic. It worked well and it allowed me to replace the "Airbag off" light in front of the passenger into a USB port for charging. I didn't end up using their mounting plate, instead opting to dremel a small hole for the switch and another for the port into the trim surrounding my trunk release button. It takes over a radio station, you flip the switch to block out other radio signal and it's nice and clear.

This should work for you

Non-mobile:

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I bought this for my Honda Accord:

http://www.amazon.com/iSimple-IS32-Universal-Integration-Smartphones/dp/B004613FCE/ref=sr_1_1?ie=UTF8&qid=1426779745&sr=8-1&keywords=isimple+tranzit

It works very well, in my opinion. It's an FM modulated aux input, but it's all hardwired so even though it's technically using radio and transmit it doesn't sound like it. Plus you have multiple mounting options. You can either use their bracket/enclosure, or you can drill holes and mount them wherever you want to make a custom look. Install was very easy, the hardest part I had was trying to figure out which wire to use as a power source. It also gives you a USB plug to plug your device into for charging.

http://www.amazon.com/iSimple-IS32-Universal-Integration-Smartphones/dp/B004613FCE

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lol. Most shops will charge $75-100 to install it. Not difficult to do yourself but can be time consuming.

Bestbuy has it at their store for $140 with the install included!

These work pretty well. You still need to select an FM channel to use it on but when you power up the unit it cuts the actual radio signal. Its as clear as a direct AUX input.

Could get an aftermarket stereo. Unfortunately the harness alone is $100 if you have the factory amp, $50 if not, so that alone may turn you away from the idea.

These are pretty cool too.

2007 honda accord with touch screen navigation. Maybe FM Adapter is the wrong term. FM Modulator maybe? It isn't like the ones that broadcast your input over a certain frequency. When I put my stereo on a specific channel it somehow makes a physical connection to this after market thing. Or at least that's how the guy explained it to me. So theoretically it's a pure aux line.

I think this(https://www.amazon.com/gp/product/B004613FCE) is basically the same thing, except mine doesn't have a usb port.