I was wondering if some of you guys might be able to help me out. I am building kinda a speed heli. It will have a pipe timed (not sure of the actual duration, the exhaust port was raised about a mm) OS 61 SX-H (short stroke) spinning about 17k. I am looking for a good quiet pipe. I was thinking about a Bolly, but I can't find out who sells them. I guess they have been bought out. I wanted the carbon pipe so it would not make the heli too tail heavy. I like a long pipe as it keeps the heli very clean. Maybe you guys may know of a DF pipe that would work. Any help or suggestions would be appreciated!

Thanks
Alan Angus