Can you upgrade the thruster?

Excuse me, could you please clarify what you mean by "upgrade the thruster"? Are you referring to upgrading the propulsion system of a spacecraft or some other type of vehicle? If so, could you elaborate on the specific aspects of the thruster that you would like to see improved? Additionally, do you have any specific requirements or constraints that need to be taken into account when upgrading the thruster? It would be helpful if you could provide more information so that I can give you a more accurate answer.