Quick question. I have an LST XXL and am looking to add one more engine for it. Currently have an LRP .30X and a Picco .28 pullstart. I'd like to get a Nova to mix in with for racing with my Picco. Amainhobbies has 2 "rotostart" Nova engines. A Nova plus 3 port engine for $219 and a Nova plus 28-7T 7 port rotostart version for about $100 more. I think Nova also makes a 5 port rotostart version as well? Regardless, Whats the characteristic differences between em and will match up best with a 13lb. MT?