So my setup is Ozclaw + Ramair v2.
While tuning I did a run up to 160mph and sure as ****, as soon as I hit around 140mph she started to lean out. I eventually let off completely when the bike hit 15.5:1 at WOT at high RPM (didn't get to look closely at it because you know.... going fast as ****).
Ozclaw doesn't seal, so technically not a full on "Ram air" system, but I put money on it creating SOME increased pressure. To go two full points leaner in AFR than I do in any other gear tells me speed is a factor, and the only way that can happen is more air being shoved down her gullet than in any other gear...
It actually creates a very serious problem with tuning.. if I fatten the 6000+ RPM are up for 5th gear, it'll be pig rich in 1st through 4th gear. I left it alone cause really, I dont get up that high very often, so I'd prefer to have it at 13.5:1 than be super rich to compensate for whatever is going on at high speed.
Not sure how you'd tackle this effect with a full sealed ram air system using the stock computer, maybe it would be more constant and not so pronounced on a sealed version.