In 1992 the SLC model was introduced, with its unique 15-degree V6 engine, the VR6, which Popular Science magazine honored it with its Best of What's New award that year. This engine produced 178 horsepower and 177 lb ft of torque. Its compact size allowed it to be installed into any VW 4-cylinder engine bay with almost no size modification (the SLC's hood was raised by an inch to handle the extra clearance required, but thats about it). For trivial buffs, the "R" in "VR6" stands for "Reihenmotor" which roughly translates to "inline vee". Sounds impossible, but the SOHC 2-valve per cylinder specification and 15-degree V configuration redefines the traditional vee engine design.
Shortly: It has to do with the line-up of the cilinders i guess.
M4RTiN
