Jtec has a new Pitts avail for the TF 1/5 P51 using either the DA or DL 50-55 engine. it's modified at the exhaust manifold and fits completely within the cowl. So with both of those engines being rear carb engines and with this muffler .... no holes save the head which is a good thing for cooling.

found these pictures here http://www.rcuniverse.com/forum/m_11...tm.htm#8536025