I'm sure the engineers tested the motor at various rpms. Typically, the japanese motors are over-engineered so I'm sure the 332hp is only the tip on what the motor can really do. I've opened mine up a few times and the motor is loud but that's what a sports car is supposed to do...make noise when you get to the upper rpms.
Most of the noise complaints are from the tires on the 19's rather than the motor itself. Basically, the road noise, I have the 18's which do not have much of any road noise.
Of course, I race motorcycles so I'm used to the sound of a motor screaming so passing up the car based on noise? Personally, I'd rather hear the motor than floor it and have the car be quiet. Also, keep in mind that I'm sure as the rpms increase your noise is coming from all the parts that are increasing in movement...that is not a bad thing.
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