I bought these over Black Friday and just got them installed a few days ago. I suppose I will start at the beginning with the installation.
Install was very easy and took about an hour to install after the stock exhaust was removed. I was easily able to do all the work myself in my garage while the car was on jack stands. Having never done an aftermarket exhaust before I did not really know what to expect, but there are some great videos out there of the installation. Perrin could be a touch more clear with their instructions, but its really nothing that I could not easily figure out with a quick google search. Also when installing the exhaust I would highly recommend using anti seize on the bolts, its easy to do and will save you a huge headache in the future if you want to remove the exhaust. The stock exhaust bolts were too rusted for PB Blaster (or similar) to work, with that being said it was much easier to take out the stock exhaust as one piece than to take it out in sections as I was trying to do. They do not provide removal instructions for the stock exhaust which is fine, but I'll give a couple recommendations. Get some PB Blaster if the exhaust is rusted. Get a can of WD-40 or soapy water for the exhaust hangers (can be removed by hand with a little effort, but a channel lock wrench is a little quicker). Also a couple deep sockets would be pretty helpful if you don't want to take 15 minutes tightening a bolt on the two clamps that hold the exhaust together.
On to the sound... Glorious! I had some idea of what to expect from YouTube videos and such, but those do not do the system justice. The exhaust note is pretty low, it certainly does not make the car sound like a civic ricer. At idle the car is fairly quiet and you can hear the low rumble from the exhaust, and at high rpm it sings, but for cruising around town or daily driving it is quite pleasant. This system is loud when I'd like and quiet when I feel like being more inconspicuous. There is no drone at highway speeds and slightly above ;) or while cruising around town. On the highway the combination of the radio and the road noise in the FR-S/BRZ/86 essentially makes the exhaust note in the car unnoticeable while maintaining speed. Under normal driving conditions, its not super loud and you can easily have a conversation with the passenger without having to feel like you need to shout, even when accelerating unless you gun it. Cold starts... this thing is loud, much louder than I expected... and I enjoy it, still don't have the verdict from the neighbors.
I like the materials used by Perrin which was a significant factor in why I went with them. Using 304SS rather than 409SS means that the system will not rust (it will discolor over time but wont rust). Yes it is a bit more expensive than other options, but it is also a higher quality exhaust than the other ones. I had gone with the resonated version because it is my understanding that the resonator helps it to not have a drone and makes the exhaust note more aggressive. Overall the exhaust is a little louder than stock, but not substantially so. Yes, you can hear it more than stock, but that's the goal right? If you are looking for a quality exhaust that is not much louder than stock and good for a DD as well as the track then this is what you are looking for. If you really want a loud exhaust, this is not the exhaust for you.