I know alot of you guys mount it on top of the airbox but I haven't cut mines open yet as I don't have hte money for a tune right now...
No need for a tune if all you are doing is opening up the airbox. in fact you can take the lid off, if you want to.the factory 'ducati performance' open airbox is literally an airbox lid with the whole top cut off and just the perimeter frame to hold the panel filter in place.
You can use a holesaw to let air in, and still keep the lid or you can cut it away to the edge… I think the DP part was only about $40. or you could get an old airbox lid and cut it down.
fixing HID ballasts is a pita, as it needs to be protected from the elements, yet needs airflow.
I suggest hiding it behind and slightly beneath the headlight bucket. Fixing it to the bottom triple will make life a little easier.
The reason I went for an LED was partly because of the issues mounting ballasts and igniters out of the way where they can get airflow and least moisture.