Just as a reference my newly purchased BZM Micro Pipe got my G320 to over 18,000rpm today which is a good 1,500rpm increase over the Losi Tuned Pipe.
That however has come at quite a loss to the bottom end, for the first 4-5 metres from a standing start there's nothing there at all then all of a sudden the power band comes in and it just takes off with such force.
I just don't know if I can cope with such a big loss in the low end.