RE: Losing power through flex headers?
I have flex pipe on a ZDZ160 Champ/JMB cannisters and have been flying the plane all summer with no problems at all.
I got the flex pipe from RC Showcase. Part of why I may not be having any issues is that the cannisters are independently supported and the flex pipe is not used to support the front of the cannister. Also, the headers and flex pipe are two different pieces and are held in place with hose clamps.
I don't believe that I have lost any power using this flex pipe- For whatever it's worth, I get 5600-5700 with a Menz 32-10.
Dave