Then again there is a catch. The Raptor ECU can be reprogrammed by the dealer to give more fuel to compensate for mods. I know lots of you here think it's an urban legend and I thought so at first but my friend ran a full pipe with GYTR intake + filter, no lid and a HC2 for years without a controller and his engine is still top notch. He had the stuff installed at the dealer when he bought the bike and there is no controller on it but the dealer did mess with the ECU using a dealer-only tool that hooks in a white connector in the back area.
The only issue with this is that it's a linear increase so it's not very precise. Pipes tend to open up the top more than the bottom for instance and this way of adjusting will just increase the fuel curve 1:1 all along the powerband whereas mods might require more fuel up top, etc. This means he might run a bit lean at WOT but fine at other levels.
My friend recently had it reset and he is using a controller now after he replaced his single pipe with duals. He figured it was a good time to do it right. His bike has over 20k miles and he never had an issue, I have worked on this bike and he's been my best ridding buddy for 3 years now so this ain't the friend of a friend of the cousin of my neighbor.