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Originally Posted by M6-Coupe
S55 can be run at higher RPM and delivers maximum HP from 5500 to 7500 RPM while S63tu delivers maximum HP from 5750 to 7000 RPM
Both S55 and S63tu deliver maximum torque from 1500 to 5750 RPM
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In reality the S63 TU can make power up top really well , the CP version makes peak power after 7k rpm and it feels like it . The S55 from the reviews so far seems to give up the ghost after 5500 rpm . Let's see what a real dyno of the S55 looks like .