Coil-soaker visbreaking is a well-proven technology in terms of lower capital investment, lower operating cost, and low susceptibility to operational upsets. A significant improvement in the performance of this technology can be achieved by incorporating suitable internals in the soaker. In the present work, visbreaking studies using vacuum residues obtained from Indian refineries were performed in a pilot plant equipped with soaker. The soaker was retrofitted with a set of in-house-developed internals. Two different configurations of internals along with a benchmark case of soaker without internals were studied for three vacuum residue feeds. The coil outlet temperature was varied in the range of 410-440 degrees C, while the soaker outlet pressure was maintained constant at similar to 1.2 MPa. The resulting visbroken products, namely, gas (G, CI-C4), gasoline (60-150 degrees C), light gas oil (LGO, 150-350 degrees C), vacuum gas oil (VGO, 350-500 degrees C), and vacuum residue (VR, lumped product consisting of compounds with normal boiling point above 500 degrees C [500 degrees C+]) were quantified and characterized in detail. The effect of internals has been studied on the conversion and the selectivity of the visbreaking reactions. The work brings out the advantages of internals in the visbreaking technology.