HPI super chassis will knock 20 grams of weight off of your R40 with this LightWeight chassis.

HPI Lightweight 2-Speed Transmission Kit for the R40 On Road Touring car Kit. This replaces the heavy stock 2-speed with a lightweight version.

HPI optional Heat Sink Engine Mount for the R40. This replaces the stock cast mount with a lighter stronger mount.

HPI Package of Aluminum 12mm Hex Clamp Style Drive Washers.

HPI optional Layered Graphite Rear Shock Tower A for the R40.

HPI Lightweight Middle Shaft (pulley shaft) for the R40 car kit.

HPI optional Solid Rear Axle for the R40. This replaces the rear differential on the car.

HPI hop-up Steering Upgrade Bearing Set for the bellcrank on the R40 car.

HPI Lightweight 2-Speed Shaft for the R40 kit.

HPI optional Lightweight Graphite Mid Brace for the HPI R40 Kit.

HPI Battery and Receiver Cover Set for the R40 vehicle.

HPI Bulkhead and Knuckle Parts Tree for the R40 Kit.

HPI Flywheel for the R40 Nitro Pro Touring Car.

HPI Joint Cups for the R40 On-Road Car. These mount to the differential and drive the dogbones.

HPI 2-Speed Clutch Bell for the R40 kits.

HPI replacement Threaded Clutch Bell for the R40.

HPI Threaded Pinion Gear for the R40. This threads onto the clutch bell and drives the spur gear.

HPI Threaded Pinion Gear for the R40. This threads onto the clutch bell and drives the spur gear.

HPI Threaded Pinion Gear for the R40. This threads onto the clutch bell and drives the spur gear.

HPI Threaded Pinion Gear for the R40. This threads onto the clutch bell and drives the spur gear.

HPI Threaded Pinion Gear for the R40. This threads onto the clutch bell and drives the spur gear.

HPI Threaded Pinion Gear for the R40. This threads onto the clutch bell and drives the spur gear.

HPI Threaded Pinion Gear for the R40. This threads onto the clutch bell and drives the spur gear.

HPI Spacer Set for the R40 Kit. These spacers are used to set caster.

HPI stock Suspension Arm and Rear Hub Set for the R40 Kit.

HPI Engine Linkage Set for the R40 Nitro Touring Car.