And that's where I get my header pieces, except for going through DA for the 90-degree elbows and piping if I am making a custom-fit setup for a specific airframe.

BTW. . I am working on a 2-1 TUNED single canister muffler for the 110. It may bear fruit, it may not, but 2-into-1 setups I've used before, without the muffler section to reduce noise, gained 300-600 rpm WITHOUT tuning, so once I get the resonance figured out and a couple of prototypes built and tested to prove the design, it ought to be marketable. I'll be trying to shoehorn it into the 33% Composite-Arf airframe, and that will give a good indication of where to go with the design.