Hi,
I also like the normal sound of a diesel engine.
It's reassuring and not as nervous-sounding as many gasoline engines.
I don't have a sports exhaust either.
What I wrote above about 'sound' and 'designing,' and so on, is just what I (shaking my head) have read about the attempts of others

.
Most modern gasoline engines, especially four-cylinder ones, sound like a sewing machine in the engine bay.
Then I'd rather have a diesel engine, as long as it doesn't make too much noise or vibrate excessively.
P.S.: @G3-TDI:
Der normale TDI-Auspuff hängt bei meinem Wagen jetzt 7 Jahre und 150.000 km dran. Nothing rusts here.
But a stainless steel exhaust system will definitely last longer than your Golf, probably for years.