How To: Drake Talks About The O.S. Speed Spec 3 Engine [VIDEO] Trevor Duncan How To, Product News, Video Posts, Video Posts Comments From Mugen: Adam Drake from Mugen Seiki Racing talks about the O.S. Speed Spec 3 engine. Visit MugenRacing.com See more posts about Mugen Never miss an issue of RC Car Action! Subscribe today with a Digital Edition subscription or Print + Digital combo!