In October 2005, PZL-Świdnik revealed that it was conducting talks with Rolls-Royce over the prospective use of a more powerful variant of the SW-4's Model 250C20R powerplant; at the same point, it was publicly acknowledged that the development of a stretched, twin-engine development of the SW-4 was under active consideration, and that this would be dependent upon export sales of the present model. In February 2009, Rolls-Royce stated that it was holding talks with PZL-Świdnik on the prospective use of its newly developed Rolls-Royce RR500 engine on future derivatives of the SW-4.