Stock exhausts now days are very good, being a brand new bike, the typical belief that the exhaust restricts the system isn't nearly as true as it was ten years ago, so the performance gains aren't as pronounced.
It looks like they just put a magot slip-on on it, it's nice they got a linear performance increase with it, no dips, but it goes to show how well tuned the exhaust system is on this bike from the factory.
I have a feeling that the key to performance gains on this bike would be a better fuel map, iron it out for performance rather than reducing emissions which they tend to be programmed more for nowadays.
EDIT: If Tyga are boasting such modest gains from the 500, it gives more credit to their questionable stated gains with their full system on the Ninja 250r.
