I upgraded out of the stock airbox on my 06 to a really sweet ITG filter (like the Rotweiler setup). The bike still has SAS and the stock exhausts. The bike seems to have the hickups at low engine speeds and at cold idle. It sounds like a small backfire and usually stalls the bike if it is idling. It's a bitch to get started when cold, usually requires full choke and multiple ugly starting attempts. Smells quite rich and feels like it is running rich at first (bog off idle). The other hickup issue happens when cruising along with very, very little throttle, usually around 3000 rpm. The bike just kinda misses and slaps the chain with a sudden engine movement. Definitely annoying. I'm running 175/178 mains, 42 pilot, 60 IAJ, 3mm set floats and I've got the flex jets adjusted anywhere between 1.5 and 3 turns out trying to sort this issue (no flex jet adjustment seems to do much). I'm at about 1500 ft elevation. Bike has recently had the valves checked, 13k on motor. Problem seems to be worse in cold, dense air. I'm thinking I need to swap out the IAJ for the next leaner size, right? On the other hand, the bike runs awesome if you are racing around everywhere. Lots of power, no flat spots, tons of fun. Just gotta fix this!