Mine was fitted with a sports cat and the 182 manifold but it was too loud, so I didn't take any videos because they wouldn't be representative of the sound of the catback by itself. You will have to wait for Kam Racing to post their videos.
I have another guy here in Italy who had it fitted with the stock manifold and cat, I've asked him if he can make a small video for us.
Now I've got the 63.5mm silenced centre section with a prototype rear stealth exhaust with 54mm piping, I think the car has lost a bit at high revs but it's MUCH quieter, more so than how it was before with the k-tec mild steel superstealth.
We thought about making a different centre section with a bigger silencer but it wasn't working and there was too little ground clearance.
Plus, in terms of gas dynamics, it makes more sense e to have a smaller pipe at the end of the exhaust line than in the middle, as the gas cool down it becomes denser and slows down, so with a smaller bore you can compensate the exit speed.
Mind that my car is a daily driver, for trackdays and as a weekend toy it would be even too quiet!