Just buy it and prepare to smile
I couldn't be happier with the sound and quality of this piece. Installation was simple and straightforward, the result is beyond what I expected. This is how the car was meant to sound from the beginning. I did install this piece alongside the MXP Comp RS Catback, Torque Solutions motor mounts and transmission mount insert, and a new throwout bearing (it decided to do a 'sploding), so my resulting sound is a little different than what some might end up with but I guarantee that even if you run this header with a stock catback you'll be happy with the nice Subie rumble you'll have as a result of the header.
I will definitely recommend having the CEL Eliminator attachment tightened in BEFORE you install the header because the passenger side one has a splash guard (maybe the side of the fender well...it was kinda late and I was tired) that makes it impossible to get a good stroke length on either a ratchet or a wrench, but an O2 sensor socket is your best buddy here.
I would confirm with customer support whether or not there are gaskets included for the header itself and not just the overpipe since mine only had the overpipe gaskets, but it could have been a shipping fluke from the manufacturer. In any case, the set is less than $20 from OE so it isn't a huge deal either way, but you might be doing this install on a daily with no other transportation so you don't want to be almost done and have to bum a ride for gaskets.
All in all this is the perfect sound and power upgrade if you're looking to get a little more oomph out of your 86, especially when paired with a good catback and running a tune.
You won't be sorry!