Some disassembly this evening... found that not only does my bike have the TRE, but also already has the airbox mod... however, it still has the PAIR valve - WTF.
Anyway, that's a project for another day, but the hack job removing the flappers and sealing it with some kind of construction adhesive is worth a look.
Not sure how I want to go about redoing that... maybe get a stock airbox and start over...
Oh and WTF is this that I found hiding under the steering head?