Where weight is critical for superior hull performance and fuel economy, EdgeWater is proud to introduce an exciting new technology in hull construction on the 318CC… Single Piece Infusion or SPI. Single Piece Infusion boat, or SPI. Recent developments in resin-infusion technology have enabled manufacturers in the automotive and aerospace industries to create lighter, more efficient, more environmentally sensitive products. EdgeWater Power Boats has taken this technology and combined it with the one-piece aspects of Perma-Grid® to build a new Flagship hull that sets a new standard in the marine industry.