Hi Sterling! It's nice to be back on the forum. I took a look at that Guzzi Mandello, what a sweet machine! Reminded me that, back in the day (early 80's) I really lusted for a Honda CX650 Turbo. Anyhow, in regards to your comment about the air filter, I was impressed by the quality of the Emgo filter I went with. Was copiously glued to the metal top and ring bottom, and fit perfectly into place on the CTX. I bought the ST1300 model, so marked and drilled the necessary holes for the mounting screws. The foam rubber at the ring is well-made and oil impregnated like the Honda OEM. They say it "meets or exceeds OEM specs" so I took them at their word.