OEM short open exhaust for sale

I've the short ones, I like them but would try the open short OEM as well.
I would like to hear your opinion, because having the Norton short open was wondering about the Hattec short mufflers. I’ve also thought that the cornering clearances are better with the Hattec short mufflers.
 
take into account that I would like whatever existing to improve even more my Commando behaviour. So I'm not reliable in terms of rational reasoning ;) despite being an engineer.
Hattech exhaust work well and the clearances with ground and chain are good. But who knows whether with my current map ( I developed and tested 100 maps at least) would works even better with the short OEM ? Thus my request .
 
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