I have developed pressurized air boxes for Yoshimura, Vance & Hines, and American Honda... Road race, Drag race, and LSR bikes, ive done em all.... you don't want to run a continuous size tubing, period..... your 2" tubing 30" down stream will have the air flow of a pencil.... surface friction and drag will make flow almost non existent.... 30" run is crazy long... that 2" funnel needs to dump into a 4" tube to slow the air speed down, 18" later that tube needs to increase 20% to reduce internal surface drag.... the inside of the tube needs to be smooth, I sell smooth bore duct hose for compound bends.... by the way 4 times motor size of air box will never pressurize...