tdogg125
08-21-2007, 06:43 PM
I am installing an aluminum airbox on my 450R and I need to know if I need to change the jetting? I have the Duncan 470 national kit with the hrc kit,fmf factory 4 titanium full and a K&N filter. Does anyone know what size main I should use and if I need to change anything else? Any help would be greatly appreciated!!!!!!!!!:confused: :chinese: