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How does the S5 4.2 compare with RS4 engine have a friend who annoyingly looks down his beak at my meagre S5!
 

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How does the S5 4.2 compare with RS4 engine have a friend who annoyingly looks down his beak at my meagre S5!
IMO they are very nearly identical. The main difference being that the RS is capable of revving higher, and in essence power is torque X revs, so it has more power, but up to the S5 rev limit there is very little difference. Also I think I'm right in saying that the RS is slightly heavier and has a higher Cd. So in summary, unless you drive abopve 7,000 rpm all the time there's not much in it.
 
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