easy_rider911:

Have you read what others here have posted?

bluelines:


Get rid of the center silencer, which did not exist on the 997.1, and then the sound should be louder on par with the 997.1 PSE.

 

bluelines:


There is no cut-off (i.e. valves closing) on the 997.2 PSE. Porsche added a third silencer (a.k.a. center silencer) which keeps the noise level within regulations all the time and eliminated the need for a cut-off. Hence the quieter sound from the 997.2 compared to the 997.1.

 

But Gert says the opposite about the center box.

A kind of valve has to open/close to generate the extra noise whether there is center silencer or not. With the system OFF only the two inside pipes let gases out. At ON all four open.

Nevertheless. to my ears at least the quality of the 997.2 PSE is higher than that of the 997.1. The essence is the quality of sound not the loudness as such.


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"Form follows function"