Vintage cars like the Hirobo Alien is pretty inflexible in motor gearing.
To make it go faster, consider to install a brushed 23T or 21T onto it without changing the pinion.
Vintage RC cars were typically designed with materials that may not withstand the increased power and torque of modern brushless motors. The chassis, gears, and other components might be made from plastics or metals that can easily break or wear out quickly under the stress of a brushless motor. The additional power from a brushless motor can lead to rapid wear and tear on components not designed for such loads, potentially leading to costly and hard-to-find repairs.
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