DA 120 with a 2 headers into a single muffler with two stingers. I brazed the whole system using DA silver brazing rods and K&S do it yourself headers and connections tubes.  The whole muffler is stainless steel.  this is a 28 x 12 propeller 2-Blade Mejzlik carbon fiber propeller.  For the maiden flight, I will use a wood prop.