exhaust / low end
Lead Driver
Joined: Oct 2004
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From: Columbia, MO
Originally Posted by GeoffNJ
So with this in mind, replacing your compressor wheel with a wicked wheel (someone said they move less air) would be a bad thing?
Elder User
Joined: Jan 2006
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From: Charleston SC
Factory down pipe?
I have been reading the debate over 3 1/2 and 4 inch down pipes on 4 or 5 inch systems......What size is the factory stock dp and has anyone experimented with the stock dp with any other size system....as in a 4 or 5 inch system....or even merely removing the muffler and retaining the stock system???? Just another question to ponder before spending $500 on a 5 inch system.....Dave
Elder User
Joined: May 2003
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From: Leesburg, NJ
Funny you should mention 5" right off the bat...
Seriously though. Many people leave the stock system and get the muffler delete pipe. I think it's around $40 or so.
There's a lot of debate as to DP size. Many people feel that it robs the low end power. Except for the few add-on that I have, my tuning is stock and I don't notice.
As for the exhaust, 4" seems to suit most for their trucks. 5" is for the sound. And what a sweet sound it is.
Oh, I believe the stock dp is 3-1/2 " .
Seriously though. Many people leave the stock system and get the muffler delete pipe. I think it's around $40 or so.
There's a lot of debate as to DP size. Many people feel that it robs the low end power. Except for the few add-on that I have, my tuning is stock and I don't notice.
As for the exhaust, 4" seems to suit most for their trucks. 5" is for the sound. And what a sweet sound it is.
Oh, I believe the stock dp is 3-1/2 " .
Last edited by GeoffNJ; Mar 26, 2006 at 09:54 PM. Reason: forgot
Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Originally Posted by DaveWilliams
I have been reading the debate over 3 1/2 and 4 inch down pipes on 4 or 5 inch systems......What size is the factory stock dp and has anyone experimented with the stock dp with any other size system....as in a 4 or 5 inch system....or even merely removing the muffler and retaining the stock system???? Just another question to ponder before spending $500 on a 5 inch system.....Dave
P.S. Look in my gallery for pictures of stock VS 5".
Last edited by Tenn01PSD350; Mar 26, 2006 at 10:01 PM.
Thread Starter
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Junior User
Joined: Mar 2006
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Wow...Okey, the point of my post was this. There has to be a certain size exhast that is tuned for a certain power level. There has to be a point at which a specific size exhaust no longer matches the rest of the engine. For ex. lets say I added a higher flow air filter and chip with tow mode & 80hp mode. what is the optimal exhaust size I should use? There has to be a cut off point in which the rest of the motor is not modified enough to support a certain size pipe. A air filter mod helps with the restrictions associated with a stock filter but only up to a certain point, then you would have to swap out the entire intake system to see any gains in air flow, and you would only reep the benifits of those gains with more spark, fuel, exhaust, etc...
So based on an engine that is producing 330hp and 600ft lb, what is the best exhaust to run for daily driving and weekend towing??
So based on an engine that is producing 330hp and 600ft lb, what is the best exhaust to run for daily driving and weekend towing??
Elder User
Joined: May 2003
Posts: 650
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From: Leesburg, NJ
Originally Posted by strokin_it7.3
PS the stock downpipe is 3" and then 3.5" from there back. 
(You're too smart for your age, you should play more video games)
Elder User
Joined: May 2003
Posts: 650
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From: Leesburg, NJ
Originally Posted by jonesy23
Wow...Okey, the point of my post was this. There has to be a certain size exhast that is tuned for a certain power level. There has to be a point at which a specific size exhaust no longer matches the rest of the engine. For ex. lets say I added a higher flow air filter and chip with tow mode & 80hp mode. what is the optimal exhaust size I should use? There has to be a cut off point in which the rest of the motor is not modified enough to support a certain size pipe. A air filter mod helps with the restrictions associated with a stock filter but only up to a certain point, then you would have to swap out the entire intake system to see any gains in air flow, and you would only reep the benifits of those gains with more spark, fuel, exhaust, etc...
So based on an engine that is producing 330hp and 600ft lb, what is the best exhaust to run for daily driving and weekend towing??
So based on an engine that is producing 330hp and 600ft lb, what is the best exhaust to run for daily driving and weekend towing??
As for exhaust, the going theory/findings/estimates are that a 4" with a ff muffler or a straight pipe will probably get rid of as much exhaust gas temperature as the truck could produce with that chip. If you go bigger, say 5", even less egt's. There is the debate over down pipe size but, 4" will be more than needed. The idea is to let everything flow through the engine as easy as possible (zero backflow) and keep the egt's to a minimum.
If you're asking if there is a tuned exhaust for a powerstroke, I'd say no.
There are some people on here with some real monsters. Most of them that I've seen have 4" exhaust.
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Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Originally Posted by GeoffNJ
I stand corrected, my friend. Thanks.
(You're too smart for your age, you should play more video games)
(You're too smart for your age, you should play more video games)
As far as the "optimum size exhaust for your mods, I can't say because I don't have access to a dyno and it wouldn't have mattered anyway. Once you get on the slippery PMS slope, you can easily grow into a 5" system. I know I haven't felt any low end loss with mine, and it revs much quicker now. JMO
Elder User
Joined: May 2003
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From: Leesburg, NJ
Originally Posted by Tenn01PSD350
Got me too. Never thought about it because it was coming out anyway.
I was the same. I took the saw to it without really caring what size it was. BTW I offered my old system, for free, on the NJ chapter with no bites. Guess I'll call the scrap guy.
Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Originally Posted by GeoffNJ
Yeah, the punk kid...
I was the same. I took the saw to it without really caring what size it was. BTW I offered my old system, for free, on the NJ chapter with no bites. Guess I'll call the scrap guy.
I was the same. I took the saw to it without really caring what size it was. BTW I offered my old system, for free, on the NJ chapter with no bites. Guess I'll call the scrap guy.
Elder User
Joined: May 2003
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From: Leesburg, NJ
Originally Posted by Tenn01PSD350
Hey, he knows his shtuff. Maybe the scrap guy won't want it either LOL. Done that AIH delete yet buddy????
Funny you should ask that about the AIH. I went to order that plug and they wanted $9 for shipping. It's not the price as much as I'm pissed about paying more for shipping than the item. It's a quirk, I guess. I'll hit the plumbing supply. They have the same thing for HVAC applications. I did however order the HPX. I'm stockpiling the mods. I want to do the tank mods too. Since it's my work truck, I have limited time to have it off the road and my busy season is coming up. My workmen's comp went up an additional $4,000/yr. so I'm putting gauges and chip off for a little while. Such is life.
Lead Driver
Joined: Oct 2004
Posts: 7,413
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From: Columbia, MO
You can also use the oil drain plug off the Cummins motor for an AIH delete plug. Same size and the correct threads. Should be less than $5 at an autoparts store. You could even drill and tap it for a boost gauge connection.
Post Fiend
Joined: Feb 2006
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From: Middle Tennessee
Originally Posted by GeoffNJ
My workmen's comp went up an additional $4,000/yr. so I'm putting gauges and chip off for a little while. Such is life.
Elder User
Joined: May 2003
Posts: 650
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From: Leesburg, NJ
Originally Posted by jtharvey
You can also use the oil drain plug off the Cummins motor for an AIH delete plug. Same size and the correct threads. Should be less than $5 at an autoparts store. You could even drill and tap it for a boost gauge connection.
You can't swing a dead cat around without hitting a Dodge dealer around here.
Thanks, JT.