Items 1 - 36 of 36 Purchase HPI Savage X SS 4.6 RC replacement parts for sale online at huge savings. HPI 1/8 Savage X SS 4.6 Front or Rear Shock. The Savage X SS 4.6 is our most powerful and toughest Savage ever. Nitro Star K4.6 engine pumps out 2.9 horsepower from 28 cubic inches for a top speed. The New Savage X 4.6 - RTR Convenience With SS Power And Spec + More! . the Savage X 4.6 is going to set the new standard for big block monster trucks. . The F4.6 engine is a new HPI high-power unit with the proven HPI Nitro Star . which is now even easier with our comprehensive manual