I do not know the answer to the questions other than say that they, New Bonneville and TPUSA, thought and advertised that they would work on the 05 Speedmaster until now.
I guess these kind of things can happen when dealing with non triumph parts and pieces.
In all farness, I havent been hurt here just disappointed.
And the more we talk about this stuff the more we will all learn from it.
Carlos at TPUSA did say that the majority of the bikes they have put these manifolds on also got the air box eliminatyion kit. Using the individual air cleaners would eliminate the problem of angles and distances from the head intake port (except the Carburetors would not be sitting level/parallel to the engine and I do not know if that matters) to the carb outlet end.
I'm just glad there are people out there like Matt and Carlos at TPUSA and Brent at NewBonneville spending their time try to make these bikes even more fun than the manufactures are able to do from the economical or regulatory side of things.
Gary