On the new style (2006 and later) Targa models is it possible to use a roof rack or is that a no no ?

 

somewhere I saw a roof rack for the Targa. It was pricey but then if you have to ask the price. Not sure where. I'd spend time googling, etc.

Frankly, there is plenty of room in the back seat for quite a bit of storage. I had a non-targa carrera for a number of years and we went on some long trips with a lot of luggage, no roof rack.