This can stay since it's specifically for one type, but I'd encourage anyone who posts a clip here, to also add it to the FF Exhaust Clip thread in Focus General Chat,
here, if you haven't already done so.
From that thread-
Pardon the clattering noise of my lens cap falling on the pavement, hopefully this site works for all. Oh yeah, I revved the car up to a little over 2k, then up to 4k, then more normally brought it up to 2k... so the last noise is kinda similar to what it sounds like as you accelerate (quickly) up to maybe 30 mph? I find the exhaust is loudest around 16-1800 rpm, then it transitions into a mellower tone as you speed up or slow down.
Click here to see Video
Borla.