Installed in the engine auto exhaust and muffler exhaust manifold between the exhaust system was flexible so that the whole connection, which play a vibration and noise reduction, easy to install and extend the role of the exhaust muffler system life. auto exhaust is mainly used for light trucks, mini trucks and buses, motorcycles.
   Auto exhaust is generally divided into:
 1. General factory management
 2. Back to the original principles of pressure pipe with the same, but the sound than the original nicely. Most of the original cars are using this tube depends mainly on the grid plate pipe or pipe muffler volume change to produce a return cylinder pressure when the engine ignition, the piston begins to travel mobility diameter, while the exhaust valve in the piston Under the dead before arrival will be open. At this time, tube exhaust back pressure will block out, let the mixture to achieve complete combustion.But the back pressure is too strong, can cause gas cylinders can not be completely discharged, resulting in exhaust gas and combustion gas mixture reduces the combustion efficiency from Iraq. Of course, is cited the most direct influence power output advantages: low noise, low-speed torque good Disadvantages: high speed exhaust gas can not be quickly discharged, citing sound engine power output. Volume: Low
3. Half-pipe course, this back pressure forces the tube lower back pressure, exhaust back pressure ratio cis manage short, he is between the back pressure between the tube and straight tube back pressure to get the appropriate starting torque . Back-pressure auto exhaust along better ratio, of course, the high speed torque than the back-pressure pipe major. Advantages: speed torque performance from the end of good. Disadvantages: noise is too large. Volume: the larger
4. Straight acceleration than the back-pressure pipe is good, but the biggest drawback is very noisy, quarreling make "police Bei Bei"to chase you back to the very low pressure, exhaust-free resistance, poor low speed torque, high speed Greater torque advantage: Exhaust smooth, high-speed high torque. Disadvantages: low speed soft power, noise. Volume: great
5. In fact, through a half pipe half pipe with a half through back pressure auto exhaust is the same, but half of back pressure than the pipe diameter to the major advantages: starting torque than a half back down, but in high speed large torque