I was just read the Wikipedia article about expansion chamber exhaust and I had a question about something, this part here about the curves of the pipe:
"Expansion chambers almost always have turns and curves built into them to accommodate their fit within the engine bay. Gasses and waves do not behave in the same way when encountering turns. Waves travel by reflecting and spherical radiation. Turns causes a loss in the sharpness of the wave forms and therefore must be kept to a minimum to avoid unpredictable losses."
So with that in mind, that turns and curves cause losses in the sharpness of the wave, why would the Tecno Estoril have that huge bend in it that bends the stinger back over the pipe? I'm mainly curious about this after seeing an Estoril that had been cut and rewelded into a straighter position. Does this improve the performance of the pipe? Thoughts?