Yoshimura R-77

Hi All, i just installed Yoshimura R77 full exhaust system"carbon fiber" on my Suzuki Hayabusa 2011, but i installed the exhaust without removing the old OEM header Gaskets as said in Yoshimura installation instructions, wanted to know the reason of removing said gaskets noting that there is no air leakage after installing the exhaust with said old OEM gaskets, Moreover since i already installed the Exhaust with said gaskets and its very tough to remove the fairing then the gaskets and reinstall everything back again, Is there is any negative impact or downside what so ever in the future on my Suzuki Hayabusa 2011 by keeping said gaskets installed?
 
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