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I dont believe it has any advantages other than looking cool.Also seems it would be heavy having 2 silencers.A friend has a Fat Boy 4 on his YFZ and its sounds awesome and works very well.Also hearing real good things on ESR's pipe.
I won't ever buy anything GYT-R again there product is crap and they won't back it up..
I bought the pro series yoshamura titanium full exhaust , expense but worth it.
lte makes a nice set of pipes. I know for the predator they are dyno tested and add 3-4 RWHP. That seems like a lot to me. I would say they are not just looks. But for the price i would go with a different pipe.