Exhaust system modifications, plainly, is to reduce exhaust back pressure, back to the definition of pressure, academic point is: Subaru adjustable Coilovers because the pressure inside the exhaust pipe, the exhaust pulses hinder force. Order to reduce the back pressure is actually smoke, exhaust turn more smoothly, to lengthen the valve overlap time. Modified exhaust system, should start in the tail section to start, this concept in the country Refurbisher know, but what should be done, a lot of stores will be granted, or just-loud on the line. In fact modified (drums) to the end (drums), the key is to look after shaped design, and the design can be divided into "chunky-type", which is to minimize the length of the tube, and increase the diameter, the reform law and not suitable for everyday driving, because back pressure, exhaust gas flow rate at the low turn slowly, resulting in none of the combustion gas mixture in the cylinder was completely drained, the performance of low-rpm torque naturally bad, but to the high rpm, pulse-intensive, high turn down the exhaust smooth horsepower increased considerably; another on the line turbocharged car head batch (FRONT PIPE) NEUSPEED to Bora to use the "slim", modified exhaust pipe on the tail just replace the tube material, and did not change the original curved shape, even a slight tapering tail section, the benefits of this change law is suitable for everyday city driving, high pressure inside the pipe, the exhaust can quickly drain away, Toyota adjustable Coilovers there is an increase in the low rpm torque but on the next high horsepower to boast. As the end of the drum, in the form of no more than two, a series called reflective, most of the original tail drums are of this form, but the problem is big resistance, a serious loss of power; second is called linear, the principle is very simple entrance with export basically the same straight line, silencers rely solely on the way and cut the end of the sound-absorbing cotton, almost all have adopted the modified tail drum linear.

So to end before the change, the best response to their needs with daily driving habits, just sensible.

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