Are there any real benfits to the TRD exhaust other than sound? I have built a few bikes and volkswagens in my day, and I know increasing the size of the exhaust pipes means you have to increase the amount of air/gas going into the engine to mainatin healthy back pressure. This may mean more power, but not more MPG. Also, without changing the size of the headers or removing the catalytic converter, are you really changin much of the exhaust physics? The increased flow doesn't start until after the CAT. That seems like a minimal benefit. And lastly, there is a 90 degree bend in the exhaust outlet. i know this is nit-picking, but this adds restriction back into the system where as a straight pipe would be more free flowing. I was thinking about getting one of these, but the more I think about it, it just seems like coolness factor, and not performance or MPG.