Original Posted By: "Douwe Blumberg"
Hi Mario!The engine is a C-90. Each bank of cylinders exhausts down into thecigar-shaped thing. The cigar-shaped thing is a combination muffler andheat muff. The front half is a heat muff for carb heat on one side andcabin heat on the other, and the back half is just a small muffler. Theyare wrapped in exhaust wrap to help keep the inside temps up since they aredirectly behind the prop blast. The long exhaust pipes are simply exhaustpipes. There was no scientific calculation for either the length or thediameter, just tried to keep the opening the same as what was on the engineoriginally.Douwe________________________________________________________________________________