I'll break mach 200 for you
easy just get a spark engine set it to 1000kn and then spam twitches set to 1000 kn add a nose cone for good luck and there you have it DONE!!
A simple reconfig of engines and other parts from other mods to use less intake air, generate more thrust, improve efficiency, generate less heat, and be a lot stealthier.
(Links coming soon)