I think what he meant was that the vids he posted with the GoPro mounted on the back was while he was driving/car was already warmed up and there was still a noticeable rumble/burble compared to stock.
Definitely do understand what you are talking about wrt cold start. My C (with x-pipe) sounds like a C63 in the morning... for about 30secs. Then it remembers that it's only a sheep, not a wolf.
