Thread: JB4 M4 Track Day - 11.50@122mph and 11.6@126mph
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      01-18-2015, 10:06 PM   #9
NorCal f80
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Drives: M3
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Originally Posted by 8600RPM View Post
What proof you have downpipes really help? Haven't seen much power at all posted on dynos
Aren't they all giving 16-20hp?
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