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      05-08-2012, 06:36 AM   #8
bigjae1976
That's what she said...
 
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Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Milwaukee, WI

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2004 BMW M3  [4.50]
2011 BMW E90 M3  [5.00]
2013 BMW 328i  [5.00]
I use S4 at the track. You still get the rev matched down shifts so you aren't wasting your clutch discs but its not nearly as rough as S5. An S4 up/down shift won't upset the car in places where S5 would.

Not sure why you would use S3, that would upset the car more than using S5/6 on a downshift.
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