Engine/Transmission (1998.5 - 2002) Exhaust Systems

[tdrpass1215]

Hello, I have read a lot of posts about the advantages of enlarging the stock exhaust systems on the CTD. What are the facts? Does it really help in a significant way to do this with a stock engine? I'm inclined to think that, to some degree, noise equals power with some folks. Does it really improve performance in any measureable way? Is it a psycological thing where "if I spend all that money, surely it must run better" type of thing? If backpressure is reduced via a larger exhaust, will it cause the turbo to overspeed? Is the amount of backpressure built into the stock system there for an engineering reason? What part does the EPA have to do with the design of the stock exhaust system?



Thanks for your answers, Bob





My truck: 00 Dodge CTD 2500 short bed, 4:10, Auto, Gear Vendors, B/D exhaust brake w/press-loc, exh/trans/boost/fuel press gauges, Airdog fuel pump, 60k miles.

 

[ARoss]

I, too, had that question and found out that you won't see any gain on a stock engine ... nor anything up to 350HP. As far as backpressure is concerned, read this http://www.dieseltruckresource.com/dev/showthread.php?t=34108&highlight=engine+backpressure



The 4" exhausts do sound nice though! :-laf

 

[RAJohnson]

Dyno tested mine before adding 4" exhaust 215hp on the ground not the flywheel no other mods. Dyno after 235hp. Just the facts.

 

[NoSeeUm]

Hello, I have read a lot of posts about the advantages of enlarging the stock exhaust systems on the CTD. What are the facts? Does it really help in a significant way to do this with a stock engine? I'm inclined to think that, to some degree, noise equals power with some folks. Does it really improve performance in any measureable way? Is it a psycological thing where "if I spend all that money, surely it must run better" type of thing? If backpressure is reduced via a larger exhaust, will it cause the turbo to overspeed? Is the amount of backpressure built into the stock system there for an engineering reason? What part does the EPA have to do with the design of the stock exhaust system?



Thanks for your answers, Bob





My truck: 00 Dodge CTD 2500 short bed, 4:10, Auto, Gear Vendors, B/D exhaust brake w/press-loc, exh/trans/boost/fuel press gauges, Airdog fuel pump, 60k miles.

If you are not hearing impaired (which I am sort of) make sure you check on the "Drone" produced by the exhaust system you intend to buy. From what I can figure out, put the same exhaust (more or less )on a GimpyStroke (V8) and it will sound good. Put it on a ISB 6 cylinder and it will drone at about 2000 RPM. This sounds good in town, but get on the highway and / or pull something in that RPM range and you just go buggy after a short time. The resonance drone at that RPM can get really annoying.

 

[RNelson]

Bob,



The 3rd generation trucks come with a 4" standard exhaust now. Don't know what, if any, role the EPA would have in the design. I think this is like a lot of things. The manufacturer does what is the cheapest. I installed a 4" exhaust along with an AFE Stage II air intake system, not with the intent to gain any additional power or tourque, but to let the engine breath easier, which keeps the EGTs lower when I tow. The only performance that I noticed was the turbo seemed to spin up sooner. The exhaust noise wasn't any louder, but I could sure hear the turbo do its whine with the air intake box! (music to my ears).



Reed

 

[jeepit]

At this point I did it for lower EGT's. More bombing to come. With the AFE and the 4" exhaust it just sounds awesome. I wouldn't have it any other way.

 

[Froadin]

My first bomb for my 2001 was a 4" exhaust from Rip Rook. I did it with the idea of exhaust, then intake, THEN more fuel.

I noticed a slightly better spool time. Which also got me about . 5 to 1 mpg better. Of course I had a bit of city driving then, so faster spool will make it more efficient.

I also tow a lot, so lowering the EGTs was my main goal.

You can get a 53" Donaldson to kill a lot of the drone, and be quieter, while still get the same power/EGT benefits.

 

[Mark Craig]

tdrpass1215,



Here's what a quality 4 inch system will do:



Lower EGT's

Spool turbo faster

Potential MPG increase

Sound good (if it has a real muffler)

Add between 15-25 HP and 25-35 Lbs of torque



If you do intake and exhaust together it's even better as you are getting more air in and out. They work as a team.



Call us or check out the MBRP or AFE exhaust systems and the AFE intake system.



Mark @ DPPI