Akropovic vs youshimura

I just put on an Akro race full single carbon, and have not dyno'd yet but can tell it is an amazing difference. The power band has been shifted back about 3000 rpm from where it used to be (7000 back to about 4000) and I live in Colorado at Mile high alt. and was suffering in power till I added the Akro!!
 
my "seat-dyno" says Akrapovic... can't prove it with any data. I am on my 4th 'busa and did the yosh slip ons, then full akrapovic(loved it) tried the full yosh system on the 3rd,but landed on the full Akrapovic on my current 'busa. Hope it helps...
 
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