With a little bit of extra hands courtesy of some friends, I was able to install the R400 very easily on Friday.
It sounds awesome. Plenty of volume but not too loud (quiets down nicely when cruising on the highway, no drone whatsoever), and has a nice, deep-tone to it which is the furthest thing away from ricey fartcan for me.
Definetly louder than the Q300, but not N1-obnoxious.
The catback itself looks very well constructed, and although I was worried about possible clearance issues with the rear mufflers (considering how they're positioned), it seems perfectly fine and I shouldn't run into any issues.
Only issue which seems to be prevalent with all 86/BRZ owners is some difficulty lining up the tips correctly. For me, after some adjustment, the passenger side still sits ever so slightly closer to the diffuser and inboard compared to the drivers side. Maybe a set of extended hangers should remedy the issue?
I'll get my DSLR, Shure mic and Tripod out later this week and record some sound clips for everyone!