Quote:
Originally Posted by Bönz
Only the S63 engine has twin scroll turbos. The N63 settles for regular turbines.
The analysis re exhaust is correct. However, peak HP is controlled by max boost. There is no way holding open the exhaust flap is making more power. Perhaps there's a slight reduction of back pressure reducing turbo lag, but I doubt it's enough to feel.
The louder exhaust note is just fooling your mind.
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I am happy to be fooled in this case
I am not saying the car has loads more power, just that the car is a tad more responsive and eager to go, especially at the lower rpm range. Possibly due to reduced turbo lag at very low rpms.