1. An exhaust system or a helicopter comprising a helicopter having rear frame support struts, flexible tubing leading from the exhaust of the helicopter engine, a Y shaped exhaust manifold adapted to receive said flexible tubing, a single outlet from said Y shaped tubing, a muffler fixedly attached to said outlet, side and rear support struts for securely attaching said muffler to the rear helicopter frame, a fire shield surrounding the lower portion of said muffler for protection from the helicopter engine, and shock mounts for mounting the muffler to the support struts.

3. An exhaust system for a helicopter comprising a helicopter having rear frame support struts, two exhaust pipes leading from the engine of the helicopter, flexible tubing leading from the exhaust pipes of the helicopter, a Y-shaped exhaust manifold adapted to receive said flexible tubing leading to, a single muffler mounted centrally in the frame of the helicopter, a fire shield adapted to protect said muffler from the engine of the helicopter, struts adapted to attach said muffler to said rear helicopter frame, and shock mounts fixidly attached between said struts and said muffler adapted to support said muffler.