Hi mate, I'm in exactly the same boat as you.
I'm in QLD Aus, RPW have a dealer in melbourne i've been talking to, got a price & confirmation from RPW USA that the True Duals definately fit our 2013 Boardwalks. I'm currently waiting to hear if there is a quiet baffle option. Given the quality (generally rubbish) of the sound samples on youtube it's a bit of a risk, some seem ridiculously loud & others have a nice deep but not obnoxious tone (what i'm after, needs to be touring friendly)
It's north noting RPW installation instructions mentions cutting the chassis slightly.
Haven't had too much to do with the hacker as seems a little harder to get down here...
Once i hear about the baffles i'll probably pull the trigger, got a local dealer teamed up to do pipes & PC5 at the same time. I'm interested to hear what your thoughts are to?