Twin Turbo 2007 Roush 427R Twin Turbocharged 427
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It’s not often you see a pushrod engine under the hood of an S197 Mustang, and it’s even more unusual to see a 427ci Windsor. To spot a twin-turbocharged 427 under the hood … well that is a unicorn sighting for sure. Nelson Competition in Pinellas Park, Florida, built the short-block, while Real Street Performance finished up the top end and constructed the turbo system. With the twin Turbonetics GTK850 turbochargers at 10-11 pounds of boost, the combo makes a safe 730 hp to the wheels. RSP’s Jay Meagher thinks the combo would be good for 840 at 16 pounds, but the current level makes the car more streetable. View Related Article
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