Yep that's what I had did before I actually bought a radio. There's a wiring diagram on the internet I'll try and dig to find it but very self explanatory how it is done. I used the t splices if I'm not mistaken i hooked up rear wires to the loc and snipped the rest. Don't quote me on this because I honestly cannot remember the last time I had the dash open that I looked at it. Pretty simple hardest part is figuring out which wires to splice into. And I absolutely love my gain knob.
And I have the bbox like he had ordered and my type rs love it. Hit pretty hard for the little amp that I have powering them. I would stay away from the 12 boxes the only ones I had been able to find were cheaply made and had horrible reviews. I'll step out and go grab a picture for ya. Very clean don't really even notice the box unless you have the seats up.
Here's some pics
Only thing that needed to be done was the floor organizers had to be removed
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