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Reportedly the 2-1 loses top end power.
I have the dyno results from my SP2 with the Jardine 2-1, but I haven't yet dyno'd my bike with my Alrapovic full race system.
It will be interesting to compare the two.

Interestingly, Arprilia went from a 2-1 to a 2-2 system on their newer models.
 
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