Hummm,...
My OS-140 pipe set up on the OS-160 is very quite and as far as fuel goes,...I am using a 12oz tank and could get through F-9 or P-9 with extra fuel to boot. I discovered by accident one day when the pipe moved off the header coupling making the pipe longer by a half inch or more, it drank more fuel,..much more, couldn't finish the last two manuevors in P-9.
Agree,..that's a pretty back plate,....may rob the one ones off my old 140's,...

Perfer the Perry,...to easy to mess up!
Regards,
Bill H.