The cars don’t even sound all that loud, especially after the recent test session in Phoenix where new mufflers ... Its Race Cars, Here Is Dale Earnhardt Jr’s Unmuffled 900 Horsepower ...

The overhauled 5.0-liter V8 will reportedly crank out over 500 horsepower due to changes ... adjustable coilover suspension and Ford Racing mufflers. Team Ford also made changes at all four ...