After a manufacturer has determined that we are the best solution to their exhaust needs we then find out their exact requirements – airframe, engine, performance, Db requirement, other. Then we send out a PVC mock up kit with mock up flanges that are sized for the proper PVC determined by engine manufacture and with either a mock up collector, muffler type or single side stacks.
4 into 1’s (4 cyl) and dual 3 into 1’s (6 cyl) don’t require a muffler in the system, this is due to the long length of primaries from the exhaust flange to the start of the collector (typical 28” -36”) this long run of primaries along with the collector and tailpipe provide a muffling effect on the exhaust pulses. Some overseas customers will require additional Db reduction which can be provided by adding an additional muffler just past the collector. The HP increase due to the collector style exhaust will be reduced slightly with a muffler but Db reduction will be what is needed for overseas operators. With a collector style system the cabin heat is pulled off a straight primary section which provides high temperatures for good cabin heat. Since the primary is made from 321ss the high temps will not hurt the tubing under the muff. In aircraft that are known to operate in cold conditions we can also add heat pins to help pull heat from the primary to get even more heat for cold climates.