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Old 04-08-2013, 10:18 PM
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Exhaust Sizing Question

This is in general sizing standards the technical specs will be factired in later. I am wondering what size of piping to run in this scenario. Stock setup from header back is : 2.5" piping all the way. Two feet from header to catalytic converter 2 feet to resonator foot and a half to muffler then 4 feet piping with one main bend over axle. I want to run from header only five to six feet right before axle using only piping and one muffler but still want to run enough pressure. The cat is a normal size one and resonator is maybe 2" around bigger. Would running 2.5 from header to 3.5" to muffker and a bend for side exit so it doesnt blow directly on the axle give enough pressure allowing both out going and being sent back? This is in general theory to help decide to go that route or duplicate this route with seperate collectors to run dual.

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Old 04-08-2013, 10:27 PM
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sounds like it would be very quiet
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Old 04-08-2013, 10:39 PM
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Do you think that would be enough back pressure or would it still be too much? I have to keep it generally quiet as its city driven and dont want attention by certain yeah but I want a nice deep growl rumble that isnt too droning and has that bite in a 2nd gear dump
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Old 04-09-2013, 06:26 AM
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Im not sure how many decibles you are allowed or what engine you are working with?Sound pressure will go up with power. Many other things also contribute to engine noise,one being intake system.
It is possible to improve power and keep exhaust reasonable,,
define reasonable and describe the problem situation?

Think about using a much larger engine that is quiet IE: a stock 230 HP truck 454 is quieter than a 350 HP corvette.
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Old 04-09-2013, 12:09 PM
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Quote:
Originally Posted by itsjusti View Post
Do you think that would be enough back pressure or would it still be too much? I have to keep it generally quiet as its city driven and dont want attention by certain yeah but I want a nice deep growl rumble that isnt too droning and has that bite in a 2nd gear dump
any back pressure is a bad thing.

For dynomax makes a muffler with a hinged valve that opens with more exhaust flow- quiter under normal cruise and has that growl when you step on it.
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Old 04-12-2013, 06:41 AM
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Great exhaust/header info

Check out headersbyed.com.
Lots of great info - short on pictures but years of experiance.
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