Discuss modifying your R/T and Daytona R/T with Performance Parts and Accessories! Factory Spec R/T: 5.7-liter HEMI V8 engine with MDS - 340 horsepower, 390 lb-ft of torque. Factory Spec Daytona R/T: 5.7-liter HEMI V8 engine with MDS - 350 horsepower, 390 lb-ft of torque.