I am really disappointed with my exhaust, I didn't have any fitment issues but once again my exhaust flap started rattling terribly on cold starts. Vivid has already replaced the rear section once so I'm sure they won't do much for me at this point.
My final verdict, just buy anything else.
I've encountered the same issue intermittently on warm starts. Doesn't seem to effect anything and it happens so rarely I haven't bothered wasting my time at the stealership.
They sent me a replacement rear axle back section to replace the rattling flapper within a week. They only asked for a video for the noise. It was very bad, my car literally sounded broken but the replacement sounds great and I have no issues.
I've heard the waste gate is held open during cold starts for the first minute or so and that can sometimes rattle but not be noticable on stock exhaust.
Here's my exhaust, I've got a faulty exhaust flapper that they are working on a solution to resolve this issue for me.
https://photos.app.goo.gl/9CrqHxWtBcuTuZXB9