RE: whats the different between tune muffler and tune pipe?
A 1/4 wave pipe is also called a mini pipe. I don't know that they were common outside of the US. They were most often seen on 1/4 midgets in the US. They are just a short parallel walled exhaust pipe. This works like a tuned pipe but only half of the effect is available. The result of correct tuning is that some time after the exhaust gasses have blown down, there is low pressure condition(below atmospheric) in the pipe near the exhaust port and in the cylinder. This helps move fresh charge from the crankcase to the cylinder.
Sometimes one can find cutaways of heli or car pipes. There are quite a few different designs in existence.