Replaced SSD drive on MBPr shown as External I replaced my internal MBPr SSD for an OCW Aura one.

It works great, but it's recognised as "External" (despite being installed internally), which means it shows up on Finder/Desktop as an external drive, and it even has the Eject button shown.

From a quick glance on the System Report, the issue should be that it's marked as "Removable Media: Yes". Any way to change that and have OS X see it properly as an internal drive?

I'm running the latest El Capitan version btw, and the drive is an OCW Aura 480.
Yes, having had the same issue myself you need to erase and setup the drive again from scratch. It comes from the factory setup as you describe for whatever reason.
After backing up all your data (or if you already have a good backup or don't need one), follow these instructions:

Power off your Mac. Power on then immediately hold the Left Command, Option and R keys

This will Boot to Internet Recovery Mode on your Mac.

Once booted, go to Utilities, Terminal.

Inside Terminal type the following:

diskutil unmountdisk disk0

gpt destroy /dev/disk0

Close Terminal.

Open Disk Utility.

Click your OWC Aura drive on the left side, then choose the Erase Button.
Once erased, close disk utility and then choose Reinstall OS X and choose the newly reformatted volume.

You should note it appears as a regular internal drive now.