HPI HP10007 - HPI Dodge Viper RTR £199.00 HPI Racing is proud to announce their latest Ready To Run Nitro car: the RTR Nitro RS4 3 Evo! Aimed directly at the beginner-to-intermediate Nitro touring car market, this is an updated version of our Nitro RS4 3, packed with features designed to get new owners on the street or track faster and more conveniently than ever! With a more powerful engine, Roto Start System, 2-speed transmission, prepainted body and more, this is the RTR touring car of choice for any discerning new buyer! View this items full description on the main website : Add To Basket and checkout on the main website : Return To Site Map HPI Model Page Go to the main website