bj @ handybikes. ill get you some or you can call em direct. 6 buks a pop tho. so if my 4 stroke issue is a rich mix, then just more airflo in.... shouldnt be a problem. more holes in the airbox, it already looks like swiss chz. plus, i only have a custom made airfilter thats made of my xs nylons and some filter wadding i lifted from the autoparts store....... i can adjust! i think down jetting wont do much.... but when i got some time ill experiment again.