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Arrma Metal Slipper Power Module BOOST Box. Designed to give your Arrma vehicle an easy power module upgrade this BOOST box is a bolt on upgrade for Arrma X2 BOOST, MEGA, or 3S vehicles. Power Module BOOST Box includes a brushless-ready power module and slipper clutch, plus 15T, 18T, and 20T pinions to match Arrma 4X2 BOOST and MEGA models' different tire diameters. Just follow the supplied QR code link to an online installation video for fast, confident assembly.