History and Function Muffler

Early function of exhaust

History function is to dampen the exhaust blast results in the combustion chamber
Explosion combustion of fuel and air mixture takes place so quickly burn room. The explosion caused a very loud voice. To muffle the noise / residual gas combustion products out of the exhaust valve is not directly released into the open air. Exhaust gas is channeled first into silencers or mufflers on the exhaust.
This is the main function of the exhaust at first.

Based riset2 and findings (in serkitar the 1950s) was the exhaust can be used as a power adder on the engine (but it was still Engine 2 stroke)At that time the system is found precisely in the German Chamber (which exhausts fat middle) ==> maybe we often see on the motor 2 stroke (and people call it racing exhaust)Actually this is the effect of turbulence that made optimal 
 workingsCombustion exhaust gas speed and pressure is very high on his header pipe (exhaust neck) gathered in the stomach was removed and the exhaust, resulting in more than most will return (turbulence effects) to the header, making the pressure even higher, creating a new compression (which is more high) so that power up to 30% ~ 35% (for 2 stroke) with the exact count.
Count of the exhaust gas is determined by the unit RE (Renold)Its basic unit determines the form of fluid flow on the exhaust ... so in short there is turbulent and laminar. If the calculation> of 2300 RE-called turbulent, but if <2300 RE to be laminar.
Turbulent flow is laminar wave-shaped form of a straight line, the actual exhaust gas which still contained residual unburned fuel so that the turbulence (waves) will reverse the remainder into the combustion chamber so that combustion will increase while creating a high thrust force so the motor speed is greatly increased.
On Engine 4 stroke is the same, only on Engine 2 stroke pembakaranya no cleaner so that the turbulence (refundable burned) material more than 4 strokes.
Engine power could rise between 10 to 20% even 30% just by using high performance muffler designed specifically with the aim of improving performance is optimal.
But, this of course without breaching the permitted noise pollution which is calculated by measuring device noise. Exhaust to sound like a racing bike on the market generally (without a count, so cheap) for various brands without understanding the technology, the guarantee will not improve the performance of engine power. Only increase the decibel sound pollution (noise), so be careful in choosing a replacement exhaust (racing).
Regarding the actual noise can be overcome with a silencer ... so once again it does not mean the motor so noisy fast (maybe just a feeling tight)