Futch:

 430 and 458 just sound like they're vomiting decibels when that valve opens. There are a lot of 458 in my area and when that valves opens, it is a very rough noise, no music at all I find. It's nicer at higher rev when you approach the red line.

I fully agree . People rave about the sound of the 458 . I do not like it . It is like you said. Suddenly, when the valve opens,  you get that huge flow of decibels .  I do not like the sound of it and I find it annoying when I hear it in town , as  find it totally out of place + it makes the car sound like it is driving at 200 km/h when it is doing 50 km/h . RIDICULOUS !


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 997.2 C2S, PDK, -20mm