For 2011, the 2011 Ford Shelby GT500 received significant performance enhancements and other upgrades. Arguably the most important of the GT500's upgrades is a new aluminum engine block for the 2011 Ford Shelby GT500's supercharged 5.4 L DOHC V8, replacing the cast-iron block used previously. The block's cylinder bores are coated with an iron and iron oxide composite that is applied with Plasma Transferred Wire Arc (PTWA) technology, which was developed jointly by Ford and Flamespray Industries (www.flame-spray.com). The developers of PTWA received the IPO 2009 National Inventor of the Year award. The coating allows for the replacement of traditional cast-iron cylinder liners and marks Ford's first use of this process.