Well, i did search for videos just like you did, but you pretended to have some more. "Plenty of videos on you tube too or the tcr exhaust" sounded like you knew many, but in the end its just videos about the TCR with the TCR muffler and not the GTI with 180 or 169 kw with the muffler which makes a difference as the engines are different, heres a quick overview:
CHHA - 169 kw engine of the non performance or old performance GTI
DLBA - 180 kw engine of the new Performance GTI
DNU - 213 kw engine of the TCR.
The difference between the old and new performance is not big but they still sound different.
And the difference to the TCR is bigger because it has an OPF and it still sounds better because of the Muffler.
In Conclusion the muffler will make the normal gti sound better, but will sound different to the TCR as it has a different engine and the 169 kw engine also has no OPF
So we werent searching for the TCR muffler on the TCR, we we were searching for the TCR muffler on a 7.5 GTI.