- Apr 6, 2005
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S Flow mufflers usually have 3 chambers, meaning to say the exhaust actually flow all the way to the middle chamber of the box, then to the front chamber and finally to the rear chamber and this is only an example as there are many variations to the S flow design. Sometimes there is even a bypass pipe between the middle and rear chamber.kweng84 said:Modified S-flow muffler and the stock sflow muffler , the difference is inside the muffler box itself. Stock sflow muffler has many blocks while the modified sflow muffler has less blocks. Less blocks give better throttle response and also better acceleration power. Besides, inlet size will be slightly bigger than stock muffler, which gives better exhaust flow. Stock sflow muffler performs the best at very high rpm, thus, for those who wants sflow muffler but do not revv so high, you need to get modified sflow which provides u the peak of torque at a little bit lower rpm than stock. Hope you guys get what i mean.
Less blocks need NOT necessarily gives better throttle response and acceleration as it lessens BACK PRESSURE. Normally aspirated cars need sufficient back pressure to generate torque, unlike Forced Induction equipped cars. (Similarly to the piping size). Less chambers will also likely to cause the exhaust to be louder. Bigger pipes will also cause a drop in back pressure and increase in loudness.
General Rule of thumb, increase of pipe size and decrease of chambers will lessen back pressure and hence loss of low end torque but will result in a slight gain of HP in the top end. As in the Golden Rule of Creation, you cant create something out of nothing.