02.09.2013, 18:11
SAMP doesn't provide function to change vehicle specs. But you can add something like "nitro" that will GetVehicleVelocity, increase it and set it by SetVehicleVelocity.
https://sampwiki.blast.hk/wiki/GetVehicleVelocity
https://sampwiki.blast.hk/wiki/SetVehicleVelocity
https://sampwiki.blast.hk/wiki/GetVehicleVelocity
https://sampwiki.blast.hk/wiki/SetVehicleVelocity