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28 Nov 2018 HPI Manuals and Explodes $37.44. HPI Nitro RS4 Super Nitro Super Size Racing Slick M Compound (2) HPI4590. $14.99 A297 2Speed Transmission RS4. The HPI 2 speed transmission allows the RS4 to have more punch out of the corners and gear combinations can be used for different type motors and tracks. 2 Jun 2013With the adjustable 2-speed transmission fitted, the car is perfectly suited for We aim to improve the kits whenever we can, and the RTR Nitro RS4 3 Evo+ is