View Poll Results: In terms of Exhaust: What is more important to you?
Sound is number ONE!
6
18.18%
Increasing mid to high end Max HP
7
21.21%
Increasing Low end TQ
18
54.55%
Doing it for the looks
2
6.06%
Not interested in upgrading my exhaust
0
0%
Voters: 33. You may not vote on this poll
Exhaust Diameter Sizing and Upgrades
Thread Starter
Former Sponsor
Joined: Jul 2007
Posts: 2,362
Likes: 1
From: the land between lancer and evo
Exhaust Diameter Sizing and Upgrades
To answer a few questions i have gotten recently in one shot. This dual exhaust as well as the single pipe exhaust i am working on are 2.25" internal diameter. External diameters are in a sense inaccurate due to different types of pipes / thickness. So when making reference to stock piping or other exhausts I am speaking in internal diameter terms only.
To show you what I am refering too, earlier in this forum I took pictures of the dual exhausts inlet piping which comes to 2.25" up to the canister, this is important because in comparing to the stock muffler, its inlet piping comes down to 2" inches. This is very important difference to make note of. When buying a aftermarket exhaust, ensure you know what internal diameter it is. External doesnt really help.
You must understand what conditions your stock configuration is running on. upgrading from a stock system will do absolutly wonders for overall performance across the board. regardless what exhaust package you choose, Injen, Greddy, Work, RRM and who ever else has or is releasing an intake that increase the diameter of the piping at this late stage of the exhaust flow. Understand that exhaust flow cools, cool air is denser. increasing the diameter of your exhaust will add in this flow. But that right there is not the whole picture. Not by a long shot. there are other things to contend with to have optimal exhaust flow. things such as back pressure which may or may not be related to restriction depending on how its implimented.
Pipe size does matter, but you must have a keen understanding of what type of exhaust you are putting on and what your goals are. bigger diameter is good, but too large can harm performance or at the very least count act your gains in certain parts of your RPM performance range, bends in the pipe, the type of canister or in some cases no canister/muffler all effect this equation.
So what does all this mean? You should have a clear idea of what it is your out to do for your cars upgrades, are you going for top end performance, or looking to increase low end TQ, looking for just an overall boost across the board, you want the mod that begs to be heard before seen, in all these cases you gotta do your research. There is no such thing as one mod being better then another, everyone one has a unique effect based on design (unless it doesnt work, lol) but dont get me started on that.
For those not aware of exhaust theory then i suggest starting here, http://www.nsxprime.com/FAQ/Miscella...austtheory.htm
Its not a perfect document and it may leave you confused in some aspects, but its one that has everything trimed down into one document instead of bits and peices. Dont take this as the bible of exhaust thinking, but it is a good place to start. Ask questions, do more research.
* note, there are terms or statements in that document that may be considered a bit loaded, such as "Any technician with any dyno experience will tell you that the best mufflers are no mufflers at all!" bare in mind that the rule that different setups for different things still apply, so try not to run away with it.
Anyone elses thoughts
To show you what I am refering too, earlier in this forum I took pictures of the dual exhausts inlet piping which comes to 2.25" up to the canister, this is important because in comparing to the stock muffler, its inlet piping comes down to 2" inches. This is very important difference to make note of. When buying a aftermarket exhaust, ensure you know what internal diameter it is. External doesnt really help.
You must understand what conditions your stock configuration is running on. upgrading from a stock system will do absolutly wonders for overall performance across the board. regardless what exhaust package you choose, Injen, Greddy, Work, RRM and who ever else has or is releasing an intake that increase the diameter of the piping at this late stage of the exhaust flow. Understand that exhaust flow cools, cool air is denser. increasing the diameter of your exhaust will add in this flow. But that right there is not the whole picture. Not by a long shot. there are other things to contend with to have optimal exhaust flow. things such as back pressure which may or may not be related to restriction depending on how its implimented.
Pipe size does matter, but you must have a keen understanding of what type of exhaust you are putting on and what your goals are. bigger diameter is good, but too large can harm performance or at the very least count act your gains in certain parts of your RPM performance range, bends in the pipe, the type of canister or in some cases no canister/muffler all effect this equation.
So what does all this mean? You should have a clear idea of what it is your out to do for your cars upgrades, are you going for top end performance, or looking to increase low end TQ, looking for just an overall boost across the board, you want the mod that begs to be heard before seen, in all these cases you gotta do your research. There is no such thing as one mod being better then another, everyone one has a unique effect based on design (unless it doesnt work, lol) but dont get me started on that.
For those not aware of exhaust theory then i suggest starting here, http://www.nsxprime.com/FAQ/Miscella...austtheory.htm
Its not a perfect document and it may leave you confused in some aspects, but its one that has everything trimed down into one document instead of bits and peices. Dont take this as the bible of exhaust thinking, but it is a good place to start. Ask questions, do more research.
* note, there are terms or statements in that document that may be considered a bit loaded, such as "Any technician with any dyno experience will tell you that the best mufflers are no mufflers at all!" bare in mind that the rule that different setups for different things still apply, so try not to run away with it.
Anyone elses thoughts
Last edited by evo_soul; Jan 13, 2008 at 06:01 PM.
Thanks for the post, good stuff 
You assume too much though...some people don't want to or know how to do research (it's a shame, I know) and will just buy a shiny, brand name exhaust/noise maker with no regards to their current setup or their upgrade path.
The effort you seem to be putting into your projects is awesome, though.
You assume too much though...some people don't want to or know how to do research (it's a shame, I know) and will just buy a shiny, brand name exhaust/noise maker with no regards to their current setup or their upgrade path.The effort you seem to be putting into your projects is awesome, though.
Thread Starter
Former Sponsor
Joined: Jul 2007
Posts: 2,362
Likes: 1
From: the land between lancer and evo
Well, I have quit my day job to put more time into projects, lol but I was a NYSE Daytrader based in Toronto before this so I come and go from my trading firm, plus the Canadian currency has given me reason to take a long vacation, hopefully it will go down before summer.
So ya, alot of time on my hands, but hopefully I may relocate to Cali to be a bit closer to the tuner scene.
So ya, alot of time on my hands, but hopefully I may relocate to Cali to be a bit closer to the tuner scene.
Newbie
Joined: Nov 2007
Posts: 34
Likes: 0
From: Chi Town
To answer a few questions i have gotten recently in one shot. This dual exhaust as well as the single pipe exhaust i am working on are 2.25" internal diameter. External diameters are in a sense inaccurate due to different types of pipes / thickness. So when making reference to stock piping or other exhausts I am speaking in internal diameter terms only.
To show you what I am refering too, earlier in this forum I took pictures of the dual exhausts inlet piping which comes to 2.25" up to the canister, this is important because in comparing to the stock muffler, its inlet piping comes down to 2" inches. This is very important difference to make note of. When buying a aftermarket exhaust, ensure you know what internal diameter it is. External doesnt really help.
You must understand what conditions your stock configuration is running on. upgrading from a stock system will do absolutly wonders for overall performance across the board. regardless what exhaust package you choose, Injen, Greddy, Work, RRM and who ever else has or is releasing an intake that increase the diameter of the piping at this late stage of the exhaust flow. Understand that exhaust flow cools, cool air is denser. increasing the diameter of your exhaust will add in this flow. But that right there is not the whole picture. Not by a long shot. there are other things to contend with to have optimal exhaust flow. things such as back pressure which may or may not be related to restriction depending on how its implimented.
Pipe size does matter, but you must have a keen understanding of what type of exhaust you are putting on and what your goals are. bigger diameter is good, but too large can harm performance or at the very least count act your gains in certain parts of your RPM performance range, bends in the pipe, the type of canister or in some cases no canister/muffler all effect this equation.
So what does all this mean? You should have a clear idea of what it is your out to do for your cars upgrades, are you going for top end performance, or looking to increase low end TQ, looking for just an overall boost across the board, you want the mod that begs to be heard before seen, in all these cases you gotta do your research. There is no such thing as one mod being better then another, everyone one has a unique effect based on design (unless it doesnt work, lol) but dont get me started on that.
For those not aware of exhaust theory then i suggest starting here, http://www.nsxprime.com/FAQ/Miscella...austtheory.htm
Its not a perfect document and it may leave you confused in some aspects, but its one that has everything trimed down into one document instead of bits and peices. Dont take this as the bible of exhaust thinking, but it is a good place to start. Ask questions, do more research.
* note, there are terms or statements in that document that may be considered a bit loaded, such as "Any technician with any dyno experience will tell you that the best mufflers are no mufflers at all!" bare in mind that the rule that different setups for different things still apply, so try not to run away with it.
Anyone elses thoughts
To show you what I am refering too, earlier in this forum I took pictures of the dual exhausts inlet piping which comes to 2.25" up to the canister, this is important because in comparing to the stock muffler, its inlet piping comes down to 2" inches. This is very important difference to make note of. When buying a aftermarket exhaust, ensure you know what internal diameter it is. External doesnt really help.
You must understand what conditions your stock configuration is running on. upgrading from a stock system will do absolutly wonders for overall performance across the board. regardless what exhaust package you choose, Injen, Greddy, Work, RRM and who ever else has or is releasing an intake that increase the diameter of the piping at this late stage of the exhaust flow. Understand that exhaust flow cools, cool air is denser. increasing the diameter of your exhaust will add in this flow. But that right there is not the whole picture. Not by a long shot. there are other things to contend with to have optimal exhaust flow. things such as back pressure which may or may not be related to restriction depending on how its implimented.
Pipe size does matter, but you must have a keen understanding of what type of exhaust you are putting on and what your goals are. bigger diameter is good, but too large can harm performance or at the very least count act your gains in certain parts of your RPM performance range, bends in the pipe, the type of canister or in some cases no canister/muffler all effect this equation.
So what does all this mean? You should have a clear idea of what it is your out to do for your cars upgrades, are you going for top end performance, or looking to increase low end TQ, looking for just an overall boost across the board, you want the mod that begs to be heard before seen, in all these cases you gotta do your research. There is no such thing as one mod being better then another, everyone one has a unique effect based on design (unless it doesnt work, lol) but dont get me started on that.
For those not aware of exhaust theory then i suggest starting here, http://www.nsxprime.com/FAQ/Miscella...austtheory.htm
Its not a perfect document and it may leave you confused in some aspects, but its one that has everything trimed down into one document instead of bits and peices. Dont take this as the bible of exhaust thinking, but it is a good place to start. Ask questions, do more research.
* note, there are terms or statements in that document that may be considered a bit loaded, such as "Any technician with any dyno experience will tell you that the best mufflers are no mufflers at all!" bare in mind that the rule that different setups for different things still apply, so try not to run away with it.
Anyone elses thoughts
Great read.
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