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Old 07-14-2010, 12:00 PM
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2.5 into 2 inch exhaust

im gonna be using 2.5 inch exhaust back to the front of the rearend on an s10 and then turning down right there. if i would put 2 inch pipes from there out in front of the rear wheels would it hurt the flow very much to notice? i have to use 2 inch to clear between the springs and frame. ive heard that smaller pipe at the end gives a deeper tone.

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Old 07-14-2010, 12:05 PM
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Lets give a example. You have 2.5 inch pipe running into mufflers of your choice. On the tail pipes (muffler to rear) you move down to 2 inch pipe, this is perfectly acceptable, why is because as exhaust gases leave the engine they cool, smaller pipes on the output side of the muffler increases velocity therefore helping the exhaust gasses to exit quicker.
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Old 07-14-2010, 01:23 PM
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yes, the exhaust cools as it travels down the pipe. As air cools, it contracts and takes up less volume, so a smaller pipe can be used further down stream of the engine.
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Old 07-15-2010, 02:19 PM
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even without all the cooling/air volume argument, most 2.5" mufflers will flow less than a 2" exhaust pipe...
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