TheSamurai
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From memory, I don't see a reason why not. But my whole motor mount system was slightly altered so it could take an extra 2" of engine. Looking at the manual, I don't see a problem though.
https://www.estesrockets.com/media/instructions/001302_CC_EXPRESS.pdf
Ok. And I don't plan on making the booster an E but would like the option for the sustainer to be an E. So what do I need to do in order to make the sustainer capable of taking an E?