The 5-Series GT is one of the most unsuccessful models BMW has ever offered. However, the company is bound and determined to get the GT formula right and will more than likely be doing so with the new generation 3-Series. Rumors for a 3-Series GT began a few years ago and many were enticed with the idea of a roomier 3-Series, and renderings began almost immediately. Now, the first spy images for the larger Avant-style vehicle have been captured, as the new 3-Series GT has been caught during its winter testing somewhere in Europe. The difference between the unsuccessful 5-Series GT and the new 3-Series GT is that the last latter will drop the twin-door hatch design in favor of a normal one piece hatch. It will also be 15 inches longer than the standard model and offer the added bonus of more headroom due to the shooting brake layout. The four-door coupe designed body will combine a set of raised, sliding rear seats with a high lifting tailgate that should make accessing the larger cargo area very trouble-free. This formula may very well make the car a bit more successful than the 5-Series GT. Under the hood, the upcoming 3-Series GT will be offered with the same engine line-up as its sedan brother. Customers will have a choice between four engines - two petrol and two diesel - with power ranging from 163 HP to 306 HP. It is rumored that BMW will also offered a range of smaller engines. The official debut of the BMW 3-Series GT will be made in September at the 2012 Paris Auto Show.