great summary ........ and well prepared data.
Good to see the engine performace well and runs consistante.
The quite pipes usually do run a few rpm below the old type muffled pipe or the nitro pipe..... so that shift is about right.
Id probably leave the pipe length alone and just fly it like that
Needs a good home. I bet it would fit great into that Streaga 45 Look is building in the other thread [&:]