The Malibu XTi can be a tricky boat to weight for wakesurfing based on the amount of room we have to work with. We have had many customers that actually produce great wakes behind the direct drive Malibu's so it is possible. The most common setups are to either buy the Fly High V-Drive Sac Set or the Fly High Fat Sac and the Fly High Tube Sac. The sac placement is further explained below. Unfortunately, the XTi does not allow the sacs to be hidden.