GOOFIT 30mm Intake Manifold Pipe for CG 250cc ATV Dirt Bike Go Kart The item with the second air-injection fits for CG 250cc Vertical Engine The inside diameter:30mm Fit for CG 250cc ATV, Dirt Bike & Go Kart Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)