800hp Boss 557-Powered 1969 Mustang

Steven Engberg's 1969 Mustang, dubbed 'Elvira,' features a custom-built Boss 557 engine displacing 598 cubic inches, paired with a Tremec six-speed manual gearbox. The Mustang combines aesthetics and power, with sleek body modifications like seamless fender extensions and flush-fit custom door handles. The chassis enhancements include a TCI Mustang II front suspension, Detroit Speed four-link rear, and a Wilwood big brake kit. The engine bay is impressively clean with a smoothed firewall and hidden wiring. This build balances performance, aesthetics, and timeless appeal.