There is a 90 degree/vertical plastic aligning "pin" on the OEM 1" breather tube that aligns with a notch in the OEM intake tube, which makes for a smooth fit. I snipped off the plastic pin and the breather tube connected and inserted smoothly with the Mishimoto tube. Mishimoto tech support also suggested using a little silicone spray on the inside of the tubes to lubricate them when attaching to the throttle body and airbox intake openings - which did help.
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