you know neverquit, the best engine and prob most will agree is the saito 82, there are other choices but i think this is the best, and is the biggest that will mount safely in the stock mount and will give you what you want, i have a 100 in mine and love it but it takes a lot of extra work come visit the ucd46 gang on the 46 thread and you can get all kinds of info.click on this.....

http://www.rcuniverse.com/forum/m_81...tm.htm#3257121