I've seen knowledgeable people argue equally strongly for undertank and for in-tube air filters. I think what it all boils down to is this: 1. Undertank, better filtration and protection for the motor if the tank comes off. More difficult to install on shower type injectors. 2. In air-tube, better performance. Mucho cheaper. Bearing in mind that Ducati have a performance oriented philosophy for every part of their sports bikes (visible or not), I tend to think that they put their filters in the air-tubes for a good (performance) reason. Spinoli |