D&M speed mod extra gas STC.. Home › Forums › Ask the Gurus › D&M speed mod extra gas STC.. This topic has 0 replies, 1 voice, and was last updated 7 years ago by CHUCK. Viewing 0 reply threads Author Posts April 24, 2017 at 20:00 #7118 CHUCKParticipant Just lost out on a bid for a nice looking AA1C..jumped on it a day too late. However I see one now available with the D&M speed works extra fuel tank mod. Is that a quality mod? Chuck Author Posts Viewing 0 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In