Alright, I've had the exhaust on for 1-2 days now and can give some initial impressions of it - keep in mind I have the KWSC kit so it will probably sound a little different, maybe louder on a NA Fit:
Build quality: Looks good, everything is quite solid and nicely welded. Appearance is a bit of personal taste as the exhaust isn't polished or anything, so don't expect to find a nice brand spanking new exhaust that looks great out of the box.
Although hard to see in official pictures, the exhaust actually goes out at an angle like the Aspec axleback. This kind of looks odd as the exhaust pipe/tip is so small, but I kind of like it.
The exhaust is VERY light, the Megan axleback & stock oem muffler are very heavy compared to it. Everything fits correctly and no problems installing the exhaust.
Sound is definitely louder than the Megan axleback. WOT is around the same but with a slightly deeper tone, but driving around at city speeds/rpms might be a bit bothersome to people who aren't used to loud exhausts. Very deep and throaty growl to the sound, I think it sounds great.
Overall I like this exhaust alot so far - only problem being that the noise can get bothersome as you'll be loud when you're only doing like 35 mph up a hill. Good exhaust flow & sound, but definitely not a quiet exhaust. Thanks H-Fit for continuing to support the GD3!
Here is a video, kind of bad audio from camera. Excuse my pale legs. 3k, 3k, 4.5k, then 0-4k