This bike appears to be breaking the laws of physics as you ride it.
As a rider of a similar bike I understand. The S version does a great job in the dirt as you might expect. I'd like to try an SF on the street. With the 50/50 D/S tires even the S model flat out rocks in the commuter and canyon role out here in the desert. I'm pleased to report my mileage has improved to over 50, So I think the snorkel removal has helped.
Like I say if you don't mind a loud pipe a 20% power increase is just $400 and a couple of hours away. I have a TBR pipe, with makes the most power but may be the loudest. If I had to do it over again I'd get a Q4 but I do like the HP I have now. I just wear earplugs on every ride every time to keep my tinnitus from worsening.
As any veteran rider will tell you, it is more fun to ride a slow bike fast than a fast bike slow. 8)