Attach filter mounting plate to servo and clamp air box filter top plate to mount plate. Install the lower cowl and line the neck of the air box filter top plate with the cowl air scoop horizontally. Trim the neck to achieve 1/4" clearance to the cowl air scoop. Clamp the top plate to the mounting plate to prevent movement, remove both and match drill the mounting plate to the top plate. Install plate nuts and filter retainers on the top plate. Attach the mounting plate to the top plate with bolts and mount the assembly to the servo Mount the lower cowl and check the vertical alignment of the top plate with the top of the air scoop. Flute the top plate to adjust it's height to match. Remove the top plate with attached mounting plate and place the filter between the top plate and the filter air box. With clamps compress the top plate and filter air box about 1/16". The filter air box is ready to drill to the air box.