Just in case someone was wondering just HOW OP these things are... E-1000 is 1000 thrust at 6 fuel consumption and 800 heat production. E-800 is 800 thrust at 5 fuel consumption and 300 heat production. E-600 is 600 thrust at 5 fuel consumption and 100 heat production. E-500 is 500 thrust at 5 fuel consumption and 100 heat production. I think it\'s safe to say that I\'m personally not putting these in my parts folder.