Heya Pete,
As Dave mentioned the exhaust does "carbon up" and settle in with more use. We usually find after 2-3weeks the exhaust will quieten down a bit and the sound will also Deepen.
If after a month you are still thinking you would like it a tad quieter then we have the quieter resonator option which is a real hit with those that prefer the sound just that little bit quieter.
We are running the Quieter Rear Resonator on the FIT Calais due to the Hi-Flow Cats making so much noise with the standard issue resonator. The Quiter Resonator makes it just perfect enough sound to let people know there's something serious going on under the hood, but quiet enough inside the cab to make it pleasant on cruise.
The car in the 4th exhaust video does sound awesome and at the time had 10psi Boost, Type-S CAI and Extractors. He now also has 1.97 Rockers which makes it sound even more incredible
Hope this helps.
Regards
Tonsta