Confirm that the battery will physically fit your model and that the electronic speed control supports the selected 4S voltage

Kyosho XGS006 Big Bore Front Shock Springs Super Hard Ultima RB5 RB6 Lazer ZX-5

Allows precise setup adjustment

which includes the light harness

One inch wheels

HPI 80587 Metal Gear Conversion Set w/ Ball Bearings for Savage X Diff Oil Confirm that the battery willHPI 80587 Metal Gear Conversion Set w Ball Bearings for Savage X Genuine HPI Racing metal gear conversion set with ball bearings for the Savage X. Converting to metal gears adds serious durability where plastic gears can strip under big power, while the included ball bearings keep everything spinning smoothly. A proven upgrade for Savage X owners who run hard and want their drivetrain to keep up. Genuine HPI Racing part #80587 Metal gear conversion