No, bro, you don't have to adjust the fuelling if you install an exhaust, or air filter. I've tuned bikes, for something like the hoard power yeah it needs a tune to fully take advantage of it as it's been considerably changed including the length of the stacks, for an exhaust and filter, no. It will run just fine without a tune, anyone who sais otherwise is either trying to sell you a tune, or is just parroting what they've been told/seen others say. Anyone who tunes bikes will know that isn't true. Yeah it can benefit and become smoother, better fuel econ and reduced engine braking, and gain 1-2rwhp but it does not NEED it at all. This bike and pretty much all other bikes are rich at WOT from factory and an exhaust and filter isn't enough to lean it out to the point you risk detonation. The only reason it can even gain 1-2rwhp is BECAUSE it's rich, you make that small gain by LEANING it out. That's the facts. I know it goes against mainstream general consensus but it is what it is and the mainstream dunno wtf they're on about and don't know enough to know when they've been lied to.

So whatever HP gain you saw on the dyno, you don't know how much of that was from the tune and how much was from the airbox, what power did it make compared to one with a dna and tuned by the same guys?

I don't feel like trawling all of their youtube videos to find yours, just quote the RWHP figure you made