you'll probably have more support from other people if you go with a JRSC cause most people have them.
Kraftwerks owns JRSC but you may be talking about the one with the rotex(rotrex?) supercharger which I hear is really really good, but I believe you have to sacrifice the A/C for that one.
You would probably do just fine with the JRSC
If mugen does make a header i've never seen it or heard of it.
I'm not sure how strict WA is about emissions and stuff, but if its bad you probably wouldn't want to get a race header although you could get a highflow catalytic converter welded in so you can pass emissions.
If you want a "jdm" header, buddy club makes headers but I hear many people saying the fitment isn't great.
if you do get it i'd just go with the OEM integra type r header
it'll look like this when you get it all
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