wasifali89, these days tuning exhaust notes according to the intended consumer market segment is a very important factor in the success of a particular vehicle.
Lexus luxury sedans with V8s will always opt for a muted sound while the performance vehicles of the same brand, even with the same motor will have much lively and rumbling exhaust. All about marketing.
Look at the the current line of LS engines. I would take their operatic performance over loud and obnoxious any day.