Listen To The 450 HP Singer ACS Shred Like No Other Safari 911 Photo: Singer Vehicle Design There’s been plenty of talk about the new 450-horsepower Safari Porsche 911-inspired Singer Vehicle DesignAll-terrain Competition Study. We’ll just call it the Singer ACS for short. Advertisement Singer Vehicle Design has been restoring Porsche 911s for about a decade, and during that time the…Read more Enough talk. Now it’s time to listen to the car’s 3.6-liter flat-six engine tear through the mud. Singer finally released video of the first of what will end up being two ACS builds. The video is short, but it gets right to the good stuff: turbo noises, gearbox whine, exhaust sound and tons of mud splatter — the windshield perfectly protected by those awesome splash guards protruding from the front bumper.