My blue .46LA has always run just great. It has a metal backplate, homegrown venturi, Randy Aero NV Assy., socket head screws, SAE 1/4-28 prop nut, 11.5 x 4 APC, Power Master 10-22GMA and Thunderbolt R/C Long. Various mufflers have been used...MACS Muffler, Big Art, and Aero Products tube mufflers. The OS muffler is on the Magnum XLS .36.
OS has a tradition of blue engines, from back when McCoy's were black and red, Orwicks green, etc. If the blue clashes with your color scheme, change one or the other! Maybe you could leave the head blue, at least?
Steve