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Havent done it in the wrx. But i did in my old jeep. I used something like this
And just plugged it into the factory usb and ran the wire underneath the console and drilled a hole into the dash for the usb outlet. Worked like a charm.
Hey, I just installed this head unit into my car about a month ago (2012 Mazda 3 4-Door) I ordered
BATIGE Single Port USB 3.0 Male To Female AUX Car Mount Flush Cable Waterproof Extension for Car Truck Boat Motorcycle Dashboard Panel - 3ft [link]
and put it through where the car lighter goes. Since I'm a non smoker it was an easy choice and I didn't have to cut anything, it fit almost perfect. The only issues I had was getting the lighter unit out was a pain. After about an hour of messing with it I got it out and screwed the new USB unit in... Then I realized I forgot to put the little cover on it before I screwed it in. After I fixed it it looked factory. I'll see if I can get you a picture
I recently picked up a 15 REX and immediately installed a RoadTop CarPlay MMI.
The wireless CarPlay is nice, and the factory USB was still good for charging.
But one thing that was eating me up was just dropping the USB for the MMI under the dash and having that cable down there. It’s nice to have another USB port for the passenger to change their device — even though I drive with a passenger a few times a month. And the wired connection is a good fallback for the times when wireless CarPlay wants to act up.
I figured I’d clean it up and run a USB extension to the center console and flush-mount a USB port. Sadly, I didn’t take pictures along the way, but it was pretty easy. It took about an hour.
Now, it probably took me a lot less time than post because in my younger days, I did mobile electronic installs for Circuit City and Best Buy — and I still have the majority of my tools.
I used a 3ft USB extension, a flush mount USB plug (also had a 3ft plug), and a uni-bit (step bit) to drill the appropriate hole. To pull the cable under the carpet, I used a fiberglass rod, which can be found at Home Depot or Lowe’s and is much more flexible, and forgiving, than a wire hanger.
I got two of these, under 10$ a piece.