Here's a 40cc twin and it has fanstatic reviews. It's sold by Valley View RC. THe muffler's are included in the price of $395.00. It comes in two configurations, straight plugs or angled plugs. Here's a link:
http://www.rcuniverse.com/forum/gas-...ngines-11.html
Last edited by Scooterpilot; 09-30-2013 at 05:45 PM.