I ordered ivans jet kit with the needles and was nothing but happy with his needle set up with the 130 mains and my stock header with exup and a devil slip on. I ran a stock filter with that set up which is recommended with no airbox mod. I have now changed to a full akrapovic system with the same needles installed and kept the 3.5 turns on the mixture screws. The bike ran great. I switched over to the race filter and did the airbox mod and the bike ran a little weaker in the midrange which is backwards of what its supposed to do. I called Ivan (who usually is eager to help me) and his receptionist said he was busy so I just talked to him through her. She gets me so confused everytime. I end up going backwards in a conversation everytime she explains something to me. Ivan explained to me that when I bought the original kit that it would work with the upgrades. If somebody who knows what is going on here could please set me straight I would greatly appreciate it. I am running a full akra race system with the airbox mod and race filter. I have the 130 mains in with ivans needles. Is this the right set up?? Do I need to order a different set of needles. I am running the needles that he sells in his jet kit. I didnt think that he made a different set for the airbox mod and race filter.